Police this afternoon released CCTV images of a man they believed could "assist our inquiries".
Beard said the female suffered minor injuries and is shaken up by this incident.
Police and Auckland Sexual Assault HELP are providing her and her family with support at this time.
Beard said the offender was described as being male, dark skinned, possibly Indian with short black hair, 175 – 180cm tall and of slim build.
"He is believed to have been wearing a dark blue jersey with white writing and aged in mid 20s or younger," he said.
"Police are in the process of carrying out a scene examination, visiting addresses nearby and are canvassing the area for any CCTV.
"This was a random attack by a stranger.
"We want to assure the community that we have a team of investigators working on this case and police will be increasing our frontline presence in the area while we work to identify and catch this offender."
Beard appealed for anyone with information to come forward - particularly residents with security cameras.
"We are now asking for anyone who saw suspicious activity in the area or for home owners in this vicinity who have CCTV cameras operating to contact the investigation team," he said.