The victim says her back and neck are bruised and swollen.
Another victim, Bianca Fortis, was pummeled last week.
"I don't know what justice looks like in this situation because I don't know anything about the alleged attacker but I do hope that he gets whatever help that he needs," Fortis said.
Sources say he was targeting light-skinned women.
One victim attacked in the Morgan Avenue subway station said she is traumatized from the attack.
"He didn't say a word, just started punching me, like randomly beating me up," victim Manal Guennad told Eyewitness News on Monday. "All I was thinking was, 'Scream. Someone has to hear you. Someone must be around. Like, just scream as loud as you can.'"