The assailant approached the woman from behind as she walked in front of 179 Mulberry Street at about 10:10 p.m. on July 22.
She was struck on the right side of her face but refused medical attention.
Cops want to find the suspect who fled northbound on Mulberry Street.
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Anyone with information in regard to the assault is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477). The public can also submit their tips by logging onto the Crime Stoppers website at WWW.NYPDCRIMESTOPPERS.COM, or on Twitter @NYPDTips.
All calls are strictly confidential, said police.