Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3395322c36a0e1…

MALICIOUS

PDF

34.8 KB Created: 2021-07-09 05:06:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4fe67499cc7a75d7ddbc5c963fe0cbde SHA-1: d8f4644d1604f59b29e807e9f4d72391bebb69b2 SHA-256: 7b3395322c36a0e1e618a8627e2f9f9ade68a15d30e05ba6d43daf6e7d7bf406
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a primary focus on a redirector hosted at 'netcdn.tw' that promises game hacks and free spins. This lure is designed to trick users into clicking the link, likely leading to further malicious content or downloads. The ML classifier and specific PDF heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/gaming-dunia-coin-master-free-spins-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/exploring-free-rs-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/robux-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-ro-hack-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-games-without-password_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/wyas-of-getting-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/stella-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-phantom-forces-aimbot-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/mobile-for-free-24-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-pins_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/dungeon-quest-roblox-hacks-script_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-obby-limited-time-only-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/hack-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/earn-free-robux_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_002_off0000307d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x307D 22904 bytes
SHA-256: 686c8a9d864b627aa11b32281f1edeb864cee360e2d770636f636d7d3330c9f3
font_01_sfnt_off000063f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F8 18740 bytes
SHA-256: b864314b23136acdbc9cef453e72c763c24c6f69c6a5d08d10340e372cc06804

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