It happened shortly after 1:00 a.m. on Sunday, April 3rd, at the ATM located at 15th and Locust streets.
Police say the victim entered en enclosed area to use the machine when the suspect came up behind him and pressed an unidentified object into his back.
The bandit told the victim not to run around, forced him from the ATM area, then withdrew cash from the victim's account.
The victim did not appear to be harmed.
The suspect is described as a black male, approximately 40 years old, unshaven wearing a green jacket and a grey "Burberry" style jeff cap.
Anyone with information is asked to contact Philadelphia police at 215-686-TIPS or submit a tip anonymously online.