Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3fb477017cfa3e…

MALICIOUS

PDF

43.3 KB Created: 2021-05-19 04:00:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ec53ee85574379ed3d51906f5e5f7154 SHA-1: 1b17500bd37a5e47e0fdc81d9bbd8891ab2034e4 SHA-256: ff3fb477017cfa3e39777d3defbd250b10b27d6839d07ce2816b9fad7706d41a
222 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. It uses a clipboard-command (paste-and-run) lure and a fake-CAPTCHA lure. The file 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 7

  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/but-link-says-free-robux-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/static-moonactive_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/earn-rbx_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_off00004ab4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB4 26008 bytes
SHA-256: a602ee044ed5d595409a24658a9c4164f9cda8a052e655dc94c6fa8625da1a86
font_01_sfnt_off0000855e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855E 18816 bytes
SHA-256: 8fbe90bccae9ee3155d3d967e7829d2e05c9e53767c9dd01fe36dc6e4248615b

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