Police said they were made aware of the assault - which reportedly took place at Preston bus station at approximately 8.40pm on October 13 - via social media.
Officers said they had no details for the victim of the attack and launched a public appeal for information on October 14.
If you have any information or know who the victim may have been, call 101 quoting LC-20211014-0342.
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Information can also be reported online at doitonline.lancashire.police.uk.
Alternatively, independent charity Crimestoppers can be contacted anonymously on 0800 555 111 or via crimestoppers-uk.org.
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