Malicious PDF — malware analysis report

Static analysis result for SHA-256 df296601fd77c31d…

MALICIOUS

PDF

45.3 KB Created: 2021-06-04 02:00:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a5d2d635f79212a75bcc5f997ae28c61 SHA-1: 9dd642b76b5935334b6b487baab415921600481a SHA-256: df296601fd77c31dd85b3a3a9fbbf7720c00b881afbe8aca8f938ef7b48bd013
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' content. The document body, though partially corrupted, also contains a URL pointing to similar lure content. These findings strongly indicate a social engineering attack designed to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/how-to-get-free-items-on-roblox-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/tiktok-free-like-website_GM835599320.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hack-coin-master-free_GM406889139.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_004_off00004e9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E9D 27220 bytes
SHA-256: 101290e6ec8778fa4e7879061b338eb15beef8cbdb983143cddb3822b230dd27
font_01_sfnt_off00008df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF4 18476 bytes
SHA-256: bcf5e908c2747fcd05be89c2efaf93907a574c840def241376182163d884a009

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