Malicious PDF — malware analysis report

Static analysis result for SHA-256 310ef1d08eb2774a…

MALICIOUS

PDF

32.5 KB Created: 2021-05-17 23:45:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 90c14a948df30f1f726858485ccaa18d SHA-1: 239dc8e4beb84b64eb213fa20215ccc9d7782c85 SHA-256: 310ef1d08eb2774a7d6a6c9d6ad2f312dd07eceea07eaee6f8c91459806249ba
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high-confidence ML classifier flagged it as malicious. The document body and heuristics indicate a lure related to game hacks and free spins, redirecting to the URL https://netcdn.xyz/app/406889139/free-spins-in-coin-master-without-human-verification-game-hack. This suggests the primary purpose is to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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-spins-in-coin-master-without-human-verification-game-hack PDF link annotation
    • http://drentklubben.se/images/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://drentklubben.se/images/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://drentklubben.se/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://drentklubben.se/images/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://drentklubben.se/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://drentklubben.se/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://drentklubben.se/images/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://drentklubben.se/images/simplysarc_GM479516143.pdfIn PDF document text
    • http://drentklubben.se/images/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://drentklubben.se/images/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000470c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x470C 24612 bytes
SHA-256: 76a0cfe50544bd19ef9c3d15f7b7785ebf0e5727a34462f6294f3668c7a8ea77

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