Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11e945b5a20bee3…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 21:58:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 21d90be52888b66d91835cd91bd23dbc SHA-1: 67c2b8e28d05ed6193cb78bce5219580e970f8c2 SHA-256: e11e945b5a20bee304f42db8a7e8a4ccdd2878ffbb481b8d7264462c30df2fef
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high-severity heuristic firing for a game hack redirect lure, pointing to a suspicious URL. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains references to game hacks and the suspicious URL, reinforcing the lure. No scripts were extracted, but the primary attack vector appears to be directing the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/free-spins-and-coins-coin-master-app-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/oginject-co_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/real-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/www-rubux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B1 24000 bytes
SHA-256: 61c28fe725ed49d0ed81937141eb156a38dfaa3f5de624b1690cf5cd8823291c
font_01_sfnt_off00008871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8871 18060 bytes
SHA-256: d4954d2d00bde9f6a1061857a61d2c62c1ae360f44744af150ee923481526d51

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