Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe472aa328e12a…

MALICIOUS

PDF

35.4 KB Created: 2021-06-25 09:17:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6b9e4e6095121934969bba9f9fc8749e SHA-1: 3325b2b8e04b2a0c2dadcdf7dc65eb58fa202c8a SHA-256: 8efe472aa328e12aadc57cb560f2a3c752c390e301c2ee1f4bc8c0a9a1d73a16
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically targeting users interested in game hacks and virtual currency. The primary lure URL, http://netcdn.co/app/431946152/robux-codes-2021-free-game-hack, is associated with known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Robux Codes' and 'Game Hack', reinforcing the lure. No scripts were extracted, but the embedded URL and heuristic firings strongly suggest a phishing or scam attempt.

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.co/app/431946152/robux-codes-2021-free-game-hack In PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/youtube-free-robux-legit_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-win-free-robux-on-chest-open-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/create-a-free-roblox-picture-for-yt_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-restaurant-tycoon-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-robux-easy-and-fast-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-no-verification-or-survey-2021_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_off000032a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A6 22348 bytes
SHA-256: 24a4127a863e7c73ca012adb8ef80395f5e13c75ad54a7df365d2e31d4d91280
font_01_sfnt_off000064a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A5 19292 bytes
SHA-256: 2cb70b7676630cbf0cedda1be4f6fcf796e21578a3b4d0bc8aa9cd823582c750

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