Hello,
This functionality is possible through the
Nop Attachments plugin. You can create an attachment with an attached PDF file that will be displayed in the Quick Tabs of your product. Users will be able to click the file and open it.
You will just need to check the
Enable Product Attachments tab setting in
Administration -> Nop-Templates -> Plugins -> Quick Tabs -> Settings and map your attachment to the
quick_tabs_product_attachments_tab widget zone.
Hope that helps!