Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa50dcce2eb3e91…

MALICIOUS

PDF

42.2 KB Created: 2021-05-15 14:07:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 93bf753e60ab638cbd6ddefa638c3b61 SHA-1: 432d601f7df9577fc26bcdd41470f1d9c8f78622 SHA-256: 9fa50dcce2eb3e9143fd34dae289a0ebd49cdb11b33b24468fc7836117daaaff
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are SEO-optimized PDFs related to game cheats and free currency. The presence of a fake CAPTCHA heuristic indicates a likely attempt to trick the user into interacting with the document, possibly to download a secondary payload or engage in a scam. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-on-pc-game-hack PDF link annotation
    • http://www.bois-ariegeois.fr/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bois-ariegeois.fr/images/rbxcity-free-robux_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
stream_003_off0000485f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x485F 26280 bytes
SHA-256: a5ff915560dec98ac24aa20390ae1811481d34f934d79227307b8b9c54b0c8c6
font_01_sfnt_off00008230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8230 18436 bytes
SHA-256: 3da4067756d8a9659bbf1d91e8f5987ff560a340f178cc4f41ff3c3676747205

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