Police released pictures of the person they say they are looking for in the attack on 4:30 a.m. on February 24.
The 22-year-old woman had just gotten off a Red Line CTA train at the Garfield stop and was walking east on Garfield when a man grabbed her jacket and threw her on the ground, police said.
The attack took place in the 100-block of East Garfield.
Police say he tried to sexually assault her, but the woman was able to fight off her attacker.
Anyone with information should call Chicago police.