Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb844720f7739fb…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 10:58:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 570f975af4ce68c0260647ba4c14fe7e SHA-1: 6c010b6b7cfe4ca79af7ac4c9d5d9a1b6b81532b SHA-256: 3bb844720f7739fbbb16bbc0768414cad6b173d011019f97789c0284a06231ae
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a document body that promotes free spins and hacks for the game Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic or distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/80-free-spins-coin-master-game-hack
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/www-coinmaster-com_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-deals_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-daily-spin-link-app_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-hack-apk-download-2021_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-apk-mod-coin-master_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/minecraft-hack-mod_GM479516143.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-game-hack-apk_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-robux-hacker-us_GM431946152.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-hack-2021_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-coins-for-coin-master_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/hack-version-coin-master-apk_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/minecraft-hacks-115-2_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000522e.bin
deb9a7fc41721e9bd030729d13a003e53e223ed19833c0299f49265bfe97e648		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522E 24264 bytes
font_01_sfnt_off000089c1.bin
c17bdfe55bcf294db1fa8b97ef7603a16e409092d20395243f391f783e354714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C1 18268 bytes

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