Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc64be4efedf51f…

MALICIOUS

PDF

33.2 KB Created: 2021-06-27 17:58:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e8ef15a10b6c3ac0cb38d1a34569c428 SHA-1: acb999940e59de6d104dc1ab0a1682f400a28d6b SHA-256: 8dc64be4efedf51f4d2c5b769733b90b18f3cd5755c752f6a0c3a95bcc5dadbd
122 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that are part of a link farm, aiming to direct users to scam websites. The document body and heuristic firings indicate a lure for "free" in-game items or currency, consistent with phishing or scamming tactics. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/how-to-get-free-clothes-on-roblox-2021-no-bc-game-hack
    • http://muslib.unmus.ac.id/repository/free-robux-group-payouts_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://muslib.unmus.ac.id//repository/earn-free-robux-on-roblox_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/roblox-royale-high-how-to-get-free-diamonds_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/tuto-comment-hack-robux_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/roblox-play-now-for-free_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/free-spins-for-coin-master-that-work_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/cheat-codes-for-hoes-roblox-song-id-bypassed_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/free-admin-roblox-how-to-turn-itto-others_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/free-rich-roblox-accounts_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/how-to-hack-step-by-step-password-pictures-roblox_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/coin-master-online-hack-generator_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/roblox-free-download-on-game_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/hack-in-counter-blox-roblox_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/free-robux-pins_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdf
    • http://muslib.unmus.ac.id/repository/free-spin-links-coin-master-2021_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/nuevo-hack-generador-de-robux-de-roblox-by-pignolise_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b57.bin
cbff5753cbd5727375cc5a6d1e2617607c99d96af1780446ded20c5245dbc6af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B57 21916 bytes
font_01_sfnt_off00005b98.bin
74f8071b005155014fc238500732bdfd03699c373f0acb49beeaf5c010266e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B98 19488 bytes

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