Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53daf3a54763b62…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 06:29:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 52a198112f78fd8ce6b895b0a1fead03 SHA-1: 4c85ff04e10ea39bb948b222fc9705094eb52f45 SHA-256: f53daf3a54763b62db977a14c2ccfd8593dac6e07c25790459a4c5ae269d3d87
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.online/app/431946152/robux-for-offers-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/tiktok-free-download-video_GM835599320.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/pokemon-go-free-joystick-hack_GM1094591345.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-can-you-get-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
font_00_sfnt_off00005029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5029 29056 bytes
SHA-256: 440e6f4746c1b21f817e9f919fcf3c71e173df87a279b4871023cc174b7f25e6
font_01_sfnt_off000090e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90E1 18012 bytes
SHA-256: 278bb2adf081b3d64a56d83d4f350a46dc6f9587b97b13dd55da789f3c3fc8ad

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