Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7c22fc0896710d…

MALICIOUS

PDF

36.2 KB Created: 2021-06-29 05:16:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bc377d74b27ebf62125214b81f9d649f SHA-1: d973cb354133f2529fbc443b515c11831f1dac8e SHA-256: 3a7c22fc0896710d281c2d0dc56241bd0ab3eeffa426ec09b96bf9fd8d034e72
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a game hack lure to direct users to a malicious URL, which in turn leads to a link farm containing numerous other PDFs. The document's structure and embedded links suggest a phishing or scam campaign aimed at users seeking in-game advantages. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.co/app/431946152/how-to-hack-a-roblox-account-with-pin-game-hack PDF link annotation
    • http://sdn4-wates.sch.id/akasia/repository/superhero-free-roblox_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/buy-stampycat-skin-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-t-oget-free-robux_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-roebucks_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-hack-1000000-robux_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-hack-models-into-roblox-t-shirts_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-change-your-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-play-now-for-free-no-download_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-get-free-robux-easy-way-2021_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-free-ply-no-download_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/do-you-get-minecraft-windows-10-for-free_GM479516143.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_off0000343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x343E 22668 bytes
SHA-256: 26bc532d4a1f75fb05d19997a461c1edcdb847531d5bbef78d2dc13642b7d5f7
font_01_sfnt_off000066ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CE 19700 bytes
SHA-256: acd580d353e6846eb81b69095da32dcbf7ca3bae8e58e94785921ea8e9221847

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