Malicious PDF — malware analysis report

Static analysis result for SHA-256 399f9cfec4164279…

MALICIOUS

PDF

39.0 KB Created: 2021-05-22 09:48:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3ef69416b9eabbea0bdee4a227cb6b8c SHA-1: 7477c81ac885b8edd30c2c78714848764e6133e3 SHA-256: 399f9cfec4164279a8fd43ed7497c2425df7dbfe5392991ab527e9a3b6a45b85
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent call-to-action button directing users to websites that promise free in-game currency or hacks for popular games like Minecraft and Roblox. The heuristic 'SE_CALLBACK_LURE' also suggests a phishing or scam context, potentially related to fake subscriptions or support. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/479516143/best-free-minecraft-servers-game-hack
    • http://ghknights.org/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • http://ghknights.org/images/coin-master-free-coins_GM406889139.pdf
    • http://ghknights.org/images/coin-master-free-coins-link_GM406889139.pdf
    • https://www.ghknights.org/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • https://www.ghknights.org/images/coin-master-free-spins-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003449.bin
efadc02db6145eceb3a2232080eb0de655c75b09f0edf57db11ed8792bb2e0a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3449 24980 bytes
font_01_sfnt_off00006de5.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE5 2940 bytes
font_02_sfnt_off000077f4.bin
c529f757d6b4a4f9c7840ecb5b6035c813da3045ee3b560268268dab20db1aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F4 17896 bytes

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