A Sydney woman has been robbed after being told "evil spirits" would bring bad luck to her family if she did not hand over her money and jewellery, and police believe she is not the only victim.

Investigators have released CCTV footage of two women they believe conned the 60-year-old victim of her belongings at the intersection of John and Hill streets in Cabramatta about 12.30pm on Thursday.

The victim had withdrawn cash from a bank when the women approached her with the warning about evil spirits, police said.

The victim added that the items would be returned to her after they were "blessed". The victim then handed over the items, police said.