In fan-fiction, Draco-Harry and Draco-Hermione pairings are very common. Their popularity is evidenced by the fact that this very site has specific tags for them. This is often attributed to Draco being cute.

And there's no doubt that Tom Felton, who plays Draco in the films, is good-looking. But is there any canonical information in the books or related material about Draco's appearance? Is he conventionally attractive? Or not so much, like most of the Slytherins we hear about save Zabini and Riddle?

Draco isn’t described as attractive or ugly.

Draco isn’t usually described as either good or bad looking. He’s mainly described as having a pale pointed face with cold grey eyes and white-blond hair, without any mention of how attractive he is. In the first book, Draco is described as having a pale, pointed face.

"In the back of the shop, a boy with a pale, pointed face was standing on a footstool while a second witch pinned up his long black robes. Madam Malkin stood Harry on a stool next to him, slipped a long robe over his head and began to pin it to the right length."
_{^{- Harry Potter and the Philosopher’s Stone)}}

He’s mentioned as having identically cold and grey eyes as his father.

"And from behind the six large figures before them came a seventh, smaller boy, smirking all over his pale, pointed face. It was Draco Malfoy."
_{^{- Harry Potter and the Chamber of Secrets}}

He’s again described as having a pale and pointed face in “Chamber of Secrets”.

"And from behind the six large figures before them came a seventh, smaller boy, smirking all over his pale, pointed face. It was Draco Malfoy."
_{^{- Harry Potter and the Chamber of Secrets}}

Further descriptions of him tend to focus on a combination of these same features.

"It was Draco Malfoy. He had pushed to the front of the crowd, his cold eyes alive, his usually bloodless face flushed, as he grinned at the sight of the hanging, immobile cat."
_{^{- Harry Potter and the Chamber of Secrets}}

His face is also described as sneering in “Prisoner of Azkaban”, in addition to being pale and pointed.

"Draco Malfoy and Harry had been enemies ever since they had met on their very first train journey to Hogwarts. Malfoy, who had a pale, pointed, sneering face, was in Slytherin house."
_{^{- Harry Potter and the Prisoner of Azkaban}}

Through the years as he gets older, the description of Draco stays the same.

"The Gryffindor team laughed loudly. Malfoy’s pale eyes narrowed, and he stalked away."
_{^{- Harry Potter and the Goblet of Fire}}

It’s mentioned that his mother Narcissa would be attractive if she didn’t look so haughty, but no observations are made on Draco’s attractiveness.

"Harry and Draco Malfoy had been enemies ever since their very first journey to Hogwarts. A pale boy with a pointed face and white-blond hair, Draco greatly resembled his father. His mother was blonde, too; tall and slim, she would have been nice looking if she hadn’t been wearing a look that suggested there was a nasty smell under her nose."
_{^{- Harry Potter and the Goblet of Fire}}

Draco is also consistently described as looking like his father.

"‘Manners, Potter, or I’ll have to give you a detention,’ drawled Malfoy, whose sleek blond hair and pointed chin were just like his father’s. ‘You see, I, unlike you, have been made a prefect, which means that I, unlike you, have the power to hand out punishments.’"
_{^{- Harry Potter and the Order of the Phoenix}}

The same words are used to describe Draco throughout the series, from his introduction to his later years.

"A teenage boy with a pale, pointed face and white-blond hair appeared from behind the rack wearing a handsome set of dark green robes that glittered with pins around the hem and the edges of the sleeves. He strode to the mirror and examined himself; it was a few moments before he noticed Harry, Ron and Hermione reflected over his shoulder. His light grey eyes narrowed."
_{^{- Harry Potter and the Half-Blood Prince}}

At no point is it mentioned how attractive he is - he’s simply described as having white-blond hair and a pale pointed face.

"Harry did not dare look directly at Draco, but saw him obliquely: a figure slightly taller than he was, rising from an armchair, his face a pale and pointed blur beneath white-blond hair."
_{^{- Harry Potter and the Deathly Hallows}}

In Deathly Hallows, Draco’s face is also described as usually languid, but that may have only be since he became a Death Eater.

"‘Of course not, of course not!’ said Lucius impatiently. He approached Harry himself, came so close that Harry could see the usually languid, pale face in sharp detail even through his swollen eyes. With his face a puffy mask, Harry felt as though he was peering out from between the bars of a cage."
_{^{- Harry Potter and the Deathly Hallows}}

Even in the epilogue, Draco is described as having a pointed chin and a receding hairline.

"Draco Malfoy was standing there with his wife and son, a dark coat buttoned up to his throat. His hair was receding somewhat, which emphasised the pointed chin."
_{^{- Harry Potter and the Deathly Hallows}}

Throughout the series, Draco is never canonically stated to be either attractive or unattractive.