Let's address the elephant in the room. You are here because you typed that specific keyword. You want a free PDF. I understand the economics of being a student in Indonesia.
A: No. Gramedia has not released an official free PDF. You must purchase the e-book or physical book. Buku Komposisi Gorys Keraf Pdf Downloadl
While you wait to buy the physical book, here are resources that cover similar material: Let's address the elephant in the room