There are many PDF creation tools out there, and many of them will not retain the hyperlinks that are present in your source document as the PDF is made.  However, if you follow our recommendations for PDF creation, the hyperlinks will remain.

If you are using a word processing program, those recommendations can be found here: 
https://support.proquest.com/articledetail?id=kA11W000000TjKoSAK

If you are using a variety of TeX, those recommendations can be found here: 
https://support.proquest.com/articledetail?id=kA11W000000fxe5SAA