Malicious PDF — malware analysis report

Static analysis result for SHA-256 370d3f05f58fe5a0…

MALICIOUS

PDF

47.6 KB Created: 2021-06-09 02:38:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c8ae913e249c04cd52bd788b676cd603 SHA-1: 41a6188f52515cff9623bddd861707e9ca4d2698 SHA-256: 370d3f05f58fe5a0c007558d962efb2c8bd702519875b08b6355549108d6a8f1
142 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 structured as SEO-optimized links for game-related cheats and downloads. The document body and heuristics indicate a lure to install browser extensions or updates, a common tactic for malware delivery or credential theft. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.tw/app/431946152/free-download-games-roblox-game-hack
    • http://lib.smklabor.sch.id/repository/free-to-play-minecraft-servers_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/roblox-hack-unlimited-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/minecraft-free-download-android-apk_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-mod-apk-hack_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-daily-spins-and-coins_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/roblox-how-to-be-builders-club-for-free_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-robux-no-human-verification-generator_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/www-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/roblox-rape_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-instantly_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/hack-coin-master-android-2021_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-hack-android-root_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/free-robux-no-scam_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-april-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000510b.bin
ee47e6e101f300fe078efa41de6fb651233363f1c3fd06ad2b065cb7ed3524ad		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510B 25624 bytes
font_01_sfnt_off00008b97.bin
e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B97 2852 bytes
font_02_sfnt_off00009559.bin
3be4cea91f6f5cdd6f9c0f14f78dd407cd8e76279d3cff67f59a438e187e799f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9559 18944 bytes

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