Malicious PDF — malware analysis report

Static analysis result for SHA-256 276b38aa1463ca9e…

MALICIOUS

PDF

34.8 KB Created: 2021-06-28 22:10:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 62f13572343c0b34c108f37d32b1f6ba SHA-1: 96037a09ab09c81d5b9ad1d0211461d9f01de8ce SHA-256: 276b38aa1463ca9e81d25453abd1ea7f8ed767ca6a5a7b455c1b0979d69e8dd8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs and text referencing free in-game items and cheats for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links and the overall theme strongly suggest a phishing or malware distribution attempt.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/free-roblox-cmds-game-hack
    • http://digilib.stie-yppi.ac.id/repository/hackear-coin-master_GM406889139.pdf
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-robux-no-ban_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/roblox-bg-brother-cheats-instructions_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://digilib.stie-yppi.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/biggerhead-roblox-free_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/roblox-gift-card-free-codes_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdf
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-items-on-roblox-android_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/blue-hack-roblox-download_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/free-robux-obby-made-by-stickmasterluke_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/how-to-change-username-on-roblox-for-free_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/hack-master-coin-pc_GM406889139.pdf
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdf
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-link-today_GM406889139.pdf
    • http://digilib.stie-yppi.ac.id/repository/free-to-play-roblox-jail-break_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/how-to-talk-to-roblox-if-you-get-hacked_GM431946152.pdf
    • http://digilib.stie-yppi.ac.id/repository/free-tiktok-like_GM835599320.pdf
    • http://digilib.stie-yppi.ac.id/repository/robux-generator-no-survey_GM431946152.pdf
    • http://netcdn.co/app/431946152/free-roblox-cm
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fc2.bin
c2216ed16998f250769f6c567f2b30b57e7d22c3f6eb86d91d5854a3a6a69e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC2 22724 bytes
font_01_sfnt_off000062c3.bin
c31916dfdd944e3efc229bf9d882cf3784eb1b7ded45e3108c9367ded9723c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 19084 bytes

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