Malicious PDF — malware analysis report

Static analysis result for SHA-256 8902a88f0e304dec…

MALICIOUS

PDF

42.8 KB Created: 2021-05-17 05:15:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 48621f3172a56eb2d340c02583090ad6 SHA-1: ba8bd63cb56cce9f005648b20fe0258b57e1738a SHA-256: 8902a88f0e304deca6b464a78f23eb6c8c3c2d5f0f2b0e60bffb53065e711661
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a lure related to game hacks and free currency, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/free-coins-coin-master-hack-game-hack PDF link annotation
    • http://jointworkstudio.com/images/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/robux-offer-wall_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/app-master_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/how-to-download-minecraft-for-free-on-windows_GM479516143.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_003_off0000494e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x494E 26176 bytes
SHA-256: 46796f6d2ecb698204877ab07620f5be06d61861f4fd9fdc8d2dda9c2f3a8df1
font_01_sfnt_off00008671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8671 17880 bytes
SHA-256: d4b290fbe96f806a63e53895600235ad07ee700a50234ed47d5e5eeda0b1e0de

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