Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d16a3c65211c6b…

MALICIOUS

PDF

40.8 KB Created: 2021-04-28 17:24:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d87d0ec7fb07487bc8dbb27a087a7f6a SHA-1: b3e98bfd121ecb16066bbeee6061d7e0ae121f5c SHA-256: 31d16a3c65211c6bff86855398801ce136c514e7fdc2922a69c482f0cee1e384
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains multiple URLs pointing to resources that claim to offer game hacks, combined with heuristics indicating a password-protected archive lure and a visual download button. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the overall theme suggest a phishing attempt to trick users into downloading malware disguised as game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/free-tkay-the-race-roblox-id-game-hack
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/cupkakerar-hack-roblox.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/hack-for-robux-2021.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/how-to-hack-a-old-roblox-account.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/free-robux-hack-2021-april.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/synapse-hack-roblox.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/roblox-jailbreak-hack-money-2021.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/how-to-get-free-bc-on-roblox-mobile.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/roblox-cheat-codes-from-nitro-fun.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/roblox-free-gift-event.pdf
    • https://www.andhrarealty.in/uploaded_files/userfiles/files/roblox-tp-to-me-hack.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000418e.bin
751c7fb9f52a47a81837585631bb35917500e25ff391c2a5dbd3c173c1055c7f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x418E 26268 bytes
font_01_sfnt_off00007c22.bin
c4d1c7d591321d679d8babb4864be57aa7f6846e08ca6c7514ed0fbb69971b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C22 18868 bytes

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