Odd url layer to hein.tr in PDF reader?

Hi —

I was reading a document I downloaded from my university's archives (an old course catalog for my uni), and my mouse accidentally hovered over a non-highlighted link when using Zotero's PDF reader. It seems to be attached/targeted to one of the words in the OCRd text. I'm afraid to click on it — it goes to http://hein.tr/. I can't tell if this was embedded for some reason in the PDF, or if this is some sort of Zotero embed. It doesn't show up as a link with a clickable target. It's strange.

Just curious if anyone knows what this might be.
  • Zotero itself doesn't add any links. However we can't speak for plugins that people install. Although most likely this just comes from the PDF file.
  • hein.tr doesn't exist -- I'd guess this is the completely harmless result of an OCR mishap
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