Avoid websites asking for credit card details or surveys to "unlock" the PDF. Many are scams. Legitimate spiritual texts are never paywalled behind suspicious links.
The Purana is traditionally divided into seven Khandas (Books): Maheshwar, Vaishnava, Brahma, Kashi, Avantya, Nagar, and Prabhasa . A good PDF should have a clear table of contents mapping these sections. Skanda Purana Malayalam Pdf--------