There is no hack to get Great Thief without heropoints, and if there was he would be swiftly banned for sure. If you go to heromart you'd see that there are many items you can purchase that don't give Character Page badges but give Heropoints.
The closest thing to a "hack" for extra free hero points is a Test Server glitch where you can get an additional 2 Free Heropoints by completing the Free Heropoints quest on the Test Server first, and then on a live non-test server after.
Some items as examples:
https://www.heromar*****m/products/thr...ectors-print-1
https://www.heromar*****m/products/thr...llectors-print
https://www.heromar*****m/products/thr...llectors-print
https://www.heromar*****m/products/thr...llectors-print
https://www.heromar*****m/products/thr...llectors-print
https://www.heromar*****m/products/bio...ployee-t-shirt
Edit:
By the way, since we've cleared up that it is very possible to do so without Heromart character page badges, and that hacking it is very unlikely, and doing so would 99.9% result in a ban, you should remove that poor lad's name from your original post.