There are several legitimate reasons why students look for a free PDF version:
The official Cervantes Institute offers a free trial of their A1 online course. It includes structured lessons similar to Prisma.
Unfortunately, I couldn't find a direct link to a free PDF download of "Nuevo Prisma A1" that I can share with you. However, I can suggest some alternatives:
(AVE Global)
This UK-based platform offers free Spanish courses (including level A1) with downloadable transcripts and exercises. It is 100% legal.
Access to the Eleteca platform for extra audio and interactive activities. 📥 How to Get Your Copy
: When you purchase a new copy of the Libro del Alumno at Edinumen, you often receive a code for the eBook version on the ELEteca platform.