Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c8000cb9e44ffd…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 19:36:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fa237cb9689263f2657daaaefebd0040 SHA-1: 576e1547a3e5b6d6d90d76e6cf4474f6ccbe2f00 SHA-256: 71c8000cb9e44ffd26f82b6ffc73336c88b35e204d36b9f6408ae4d45ffc3b52
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains embedded URLs and a call-to-action phrase, strongly suggesting a lure for users to download malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'password-protected archive' heuristic indicates a common technique to bypass security scanners by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/robux-website-game-hack
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-to-hack-roblox-jailbreak_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/hacks-de-roblox-para-cualquier-juego_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/roblox-surf-hack_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/coin-master-hack-spins-apk-download_GM406889139.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/free-robux-com-2021_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/roblox-hack-tool_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/coin-master-free-spins-app_GM406889139.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/hack-robux-roblox-2021_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/roblox-free-vip-server_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/robux-generators-that-actually-work_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/mcpe-master-free-coins_GM406889139.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/get-free-spins-in-coin-master_GM406889139.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-to-hack-robux-with-cheat-engine-67_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/spin-rewards-coin-master_GM406889139.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/how-to-hack-a-roblox-game-without-cheat-engine_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/mcpe-download_GM479516143.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/free-robux-without-verification_GM431946152.pdf
    • https://www.failtesolar.com/uploaded_files/userfiles/files/roblox-hack-client_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ee5.bin
945a4fff91e83d1120251e4d8ceb32eff4f04a7f6d4bc4f50212d11e849fb29b
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE5 22640 bytes
font_01_sfnt_off00006161.bin
2be0fca1477d06bba603c393dad1761654b53599fc718925d7eece702ba6c269
pdf-font-stream PDF embedded font (sfnt) at offset 0x6161 18976 bytes