Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e36f054f255476…

MALICIOUS

PDF

43.4 KB Created: 2021-06-14 01:46:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 53aefe20f880be697d0fec34cbfdf04f SHA-1: 54196e0dae799c39492935998e4c0799c38e5cc0 SHA-256: 42e36f054f25547634e7486a1c0cd46f6ab2cf4b1fa3e390d14f9b9dfa623281
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/injector-hack-for-roblox-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-welcome-to-bloxburg-money-cheat-august-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/get-old-roblox-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/glitches-for-free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/cheat-roblox-windows-store_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-hack-2021-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-hack-download-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-2021-july_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-link-blogspot_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
font_00_sfnt_off00004ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA1 25364 bytes
SHA-256: 99f72793246b01c219bfa81467ba4c89c5b986ccf89b6bb1131207b6fda8f2fc
font_01_sfnt_off000085d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D0 18824 bytes
SHA-256: bedb908f4727d19a194688f097ab6109543e0105aa47f9c20ab6a0cd9a7b7e4a

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