Malicious PDF — malware analysis report

Static analysis result for SHA-256 8333ab3ec5544b76…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 23:07:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f8ed9bfb117877253c1ffd810fe136aa SHA-1: 4a440a44d74bcb896447b1d31cfeb60d4cacd085 SHA-256: 8333ab3ec5544b769fdc35bbbfc6f8ea5ac3bd5d999feafed0f494f59e800910
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on potentially malicious content, disguised as free game hacks and currency generators. The document body and heuristics indicate a redirection chain leading to SEO-optimized PDF links, likely to distribute malware or facilitate phishing. No scripts were extracted, but the extensive link farm and redirection infrastructure are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/479516143/how-to-install-minecraft-for-free-game-hack In PDF document text
    • http://suaedy-library.net/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-redeem-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/cheats-for-getting-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-have-free-clothes-on-roblox-2021-no-bc_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-free-followers-bot_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-roblox-accounts-2021-not-been-used_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/auto-redeem-roblox-hack_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/jentplays-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-generator_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_off000031ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AC 22280 bytes
SHA-256: 32d2ec803631615c0374c1566ba6b0a71d33b07ff2c06099d9fd3532e6d79b60
font_01_sfnt_off0000630d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630D 18236 bytes
SHA-256: 80f9f3d3ddf194f52a7f748b585b61cd03432ad9892c468e4e347190080fe4ef

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