The 72-year-old woman was on a staircase at the Jackson Heights-Roosevelt Avenue station at 11:13 p.m. Saturday when the stranger kicked her from behind, sending her tumbling backward down the staircase, the NYPD said.

The attacker said nothing before punting the woman as she made her way toward a staircase, cops said.

The badly bruised victim was taken to NYC Health and Hospital/Elmhurst for treatment.

The NYPD shared surveillance images late Sunday of the suspect, who is believed to have fled on a northbound F train.

The photos show a dark-haired man wearing a black jacket, red shirt, blue jeans and black and white Nike sneakers.

No arrests had been made as of Monday.