A mugger possibly posing as a UPS delivery man beat a woman with a weighted sock and robbed her of $25 inside the elevator of a Manhattan building over the weekend, police said Sunday.

The 26-year-old victim was getting off the lift in the building at East 27th Street and Third Avenue in Kips Bay at around noon on Saturday when the creep pulled her back in and beat her “multiple times” in the back of the head with what cops described as “a sock filled with an unknown object.”

He then grabbed the small amount of cash from her bag and fled on a bike, according to police.

Police were looking for a suspect who appeared to be impersonating a UPS delivery man in connection with the scary attack.

Surveillance images released by the NYPD showed him wearing a black outfit and grey cap with lanyard around his neck while toting a UPS package and luggage.

The victim was treated at Bellevue Hospital, where she was in stable condition, authorities said.