Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92cf3061de10a08…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 07:12:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 49a5ef5c737eff1a1d1df9773627199e SHA-1: 6b2aa4749fd118461814e50b3787a4b13ce7ef17 SHA-256: e92cf3061de10a08392b32613247a81168a8d0523e8dc3e534bde690f1d3326f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as SEO spam, pointing to sites offering game cheats and free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' model strongly suggests malicious intent. The document body also contains a call to action, 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', further supporting the lure for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/406889139/coin-mster-free-game-hack
    • http://library.umla.ac.id//repository/instant-free-spins-coin-master_GM406889139.pdf
    • http://library.umla.ac.id/repository/free-robux-gift-card_GM431946152.pdf
    • http://library.umla.ac.id/repository/how-to-cheat-in-roblox-tycoons_GM431946152.pdf
    • http://library.umla.ac.id/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdf
    • http://library.umla.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://library.umla.ac.id/repository/coin-master-hack-mobile_GM406889139.pdf
    • http://library.umla.ac.id/repository/coin-master-hack-no-survey_GM406889139.pdf
    • http://library.umla.ac.id/repository/rbx-land-free-robux_GM431946152.pdf
    • http://library.umla.ac.id/repository/minecraft-free-app_GM479516143.pdf
    • http://library.umla.ac.id//repository/get-free-spins-link-in-coin-master_GM406889139.pdf
    • http://library.umla.ac.id//repository/how-to-get-free-snacks-on-coin-master_GM406889139.pdf
    • http://library.umla.ac.id//repository/free-robux-offers_GM431946152.pdf
    • http://library.umla.ac.id//repository/how-to-log-out-of-coin-master_GM406889139.pdf
    • http://library.umla.ac.id/repository/roblox-get-free-robux-now_GM431946152.pdf
    • http://library.umla.ac.id/repository/free-robux-with-nothing-just-pick-amount-thats-it_GM431946152.pdf
    • http://library.umla.ac.id//repository/www-coinmaster-com_GM406889139.pdf
    • http://library.umla.ac.id/repository/identifty-fraud-roblox-maxe-1-cheat_GM431946152.pdf
    • http://library.umla.ac.id//repository/coin-master-cheat-engine-hack_GM406889139.pdf
    • http://library.umla.ac.id/repository/how-to-create-a-roblox-game-for-free_GM431946152.pdf
    • http://library.umla.ac.id//repository/how-do-you-get-free-robux-without-paying_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ebe.bin
f7ad6b60946ac30b2d3d8094c27edb80eea1f65c9486bdf4acfb198f6c98df83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EBE 22760 bytes
font_01_sfnt_off00006194.bin
f7d90c742ed77143965e1bd6f19d83d4aa1a1c074d0feb44f390a9defa22430a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6194 17996 bytes

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