Malicious PDF — malware analysis report

Static analysis result for SHA-256 685cbf2e67378a26…

MALICIOUS

PDF

34.8 KB Created: 2021-06-19 13:52:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0d0a9528b37ac3c9ba450ee9b6fa25d7 SHA-1: c8a4565eae621f2a4f6bb86b5b041e0bfa4fbe5a SHA-256: 685cbf2e67378a26b343038f2a3a351f6c07b3f501064dfba06918952b573ec4
122 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are related to game hacks and free in-game currency, suggesting a lure for users to download malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports this assessment. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/infident-jump-hack-roblox-game-hack
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://smpn1sda.sch.id/slims/repository/roblox-free-robux-hack-no-human-verification_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/free-robux-no-gift-card_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/get-free-robux-without-human-verification_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/links-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://smpn1sda.sch.id/slims/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/facebook-coin-master-free-spins-link_GM406889139.pdf
    • http://smpn1sda.sch.id/slims/repository/coin-master-play-online-free_GM406889139.pdf
    • http://smpn1sda.sch.id/slims/repository/coin-master-hack-apk-download-2021_GM406889139.pdf
    • http://smpn1sda.sch.id/slims/repository/2021-free-games-to-play-roblox_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/cool-roblox-free-outfits_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/robux-no-human-verification-2021_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/daily-spins-coin-master_GM406889139.pdf
    • http://smpn1sda.sch.id/slims/repository/free-robux-scam-model_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/roblox-verification_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/hydra-roblox-game-that-gives-free-robux_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/how-can-i-get-free-robux_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/bloxburg-hack-roblox-pastebin_GM431946152.pdf
    • http://smpn1sda.sch.id/slims/repository/free-gifts-coin-master_GM406889139.pdf
    • http://smpn1sda.sch.id/slims/repository/coin-master-online-hack-tool_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f01.bin
67e24abf1d3772c84bf5161b8dec4a9bb11394bf5eeec802a63e57f0c33b07d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F01 22376 bytes
font_01_sfnt_off00006094.bin
0b515d29b4dbd203e3b15e005ff66dbaa2f4f6dbe28996d0ed804e7b111386d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6094 19796 bytes

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