The incident took place at around midday on Tuesday in the Pollok area of Glasgow.
The 28-year-old victim was walking along the underpass in the direction of Boydstone Road, from Fairhill Avenue, when she was attacked by four men.
She was not seriously injured but was left shaken by the incident. She is believed to have been specifically targeted.
Detective Inspector Graeme McLachlan, said: “This attack happened in broad daylight close to a busy shopping centre and it is understood that the victim may have been targeted because she was known by one of the men involved.
“Officers have been carrying out extensive inquiries, however we still need to speak to anyone who may have been in the area around the time of the incident.
“In particular, we would like to speak to two women and a man, who had blond hair and was wearing a dark coloured tracksuit, possibly as part of a work uniform, who were seen walking in the direction of Fairhill Avenue as the incident was taking place.”
The first man is described as white, aged between 40 and 49, of medium build and wearing a black coat and jeans.
The second man is white, between 30 and 40, of slim build and wearing a dark tracksuit.
The third suspect is white, 30-40 and was wearing a red hat and green T-shirt, while the fourth man is white and aged in his mid-30s.
Anyone with information can contact police via 101, or alternatively anonymously via Crimestoppers on 0800 555 111.