Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d79a4aff3de3256…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 09:32:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c37ea6763c53be6ac6574ae194734e74 SHA-1: eb3243a211f15e70e00f68caacfbb181d22ec244 SHA-256: 5d79a4aff3de3256273fa315fdb293435e05cb41d9ffca8290d95b2120da7299
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by an ML model and contains a high-severity heuristic indicating it links to a game hack redirector. The document body and embedded URLs promote 'free game items' and 'templates' to lure users to the malicious URL http://netcdn.tw/app/431946152/free-roblox-shirt-templates-2021-game-hack. While no scripts were extracted, the PDF structure and linked content strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-roblox-shirt-templates-2021-game-hack PDF link annotation
    • http://lib.stie-aub.ac.id/repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-anti-cheat-video_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-kitty-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/cheat-engine-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-on-roblox-group_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-jailbreak-money-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-hack-2021-no-human-verification-pc_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hack-robux-using-chrome-web-store_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-scar-h-free-in-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/pubg-uc-redeem-code-2021_GM1330123889.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/get-free-robux-no-verification_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
font_00_sfnt_off00002ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF2 22688 bytes
SHA-256: 99f1b3e0e34b572bdbea6b4cfb9c9c4864687ee9495fd7d2ce450bab10197c6e
font_01_sfnt_off000062d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 19880 bytes
SHA-256: 170171e72ed44fe2d1671d198052de416a0c1db0a25c3152879e7d45f71f48b4

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