Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a597464e72efe7…

MALICIOUS

PDF

45.5 KB Created: 2021-06-11 11:54:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2c17e80deaa5b5736ef997af6e73ff4f SHA-1: 8100e325bc4baca0abcda73523aa22b16442a884 SHA-256: 53a597464e72efe7e26f3a126213e201457efc717f909923c13e43f5d4b059df
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses 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 0.9864

Heuristics 5

  • 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.
  • 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.tw/app/431946152/site-to-have-free-robux-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/cheat-on-roblox-ghost_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-muscle-legends-cheat_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/tiktok-free-pictures_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-items_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-underfighters-2-cheat-codes_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/www-roblox-com-games-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/new-roblox-hack-exploit-for-murder-mystery-2_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-hack-youtube_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/what-do-points-do-in-roblox_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_off0000531b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x531B 26668 bytes
SHA-256: 2abecf8205decf3b601b0a58dd7c632513a914b0a8dc99e4652d80ab8e4b710d
font_01_sfnt_off00008e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E92 18580 bytes
SHA-256: 2834af95785bfc24da99d979ffde09e42df85263580215bc21d5a29bc2969ca1

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