Many learners want the audio files more than the book. The PDF is useless without the CD or MP3s. However, once learners have the MP3s (often ripped from old CDs), they realize they need the question book to follow along. Hence, searching for the PDF + Audio set.

If you are financially unable to purchase the textbook, here are legitimate alternatives to the Shin Kanzen Master N3 Choukai PDF that won't get you into legal trouble:

Many free PDFs are poorly scanned, angled, or watermarked. For a listening book, you need clear legibility to read the questions quickly between audio tracks. A blurry scan will actually hurt your test-taking speed.