Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ab0177cc29f299…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 19:37:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 691b1af2828d823fd25a329e552ae1cf SHA-1: abc0e9ab6ece5aaf9b9186aecea29328794c5086 SHA-256: 79ab0177cc29f2990498c57adf424334231b619eb94f7e27db1e39ce7490a5b8
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 0.9980

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 http://netcdn.tw/app/479516143/minecraft-education-edition-free-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/roblox-login-free-account_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-spiele-hacke_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/cheat-course-dobstacles-dlirante-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/reaper-quest-cheats-engine-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/doing-free-robux-games_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-cheatengine_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-jailbreak-edid-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-hack-generator-download_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-accounts-with-obc_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-pc-cheats_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-epic-mining-2-cheats_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/mouse-ears-roblox-free_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-got-hacked-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-gift-card_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_off00002f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3E 22120 bytes
SHA-256: edc027beeed9a2d795bd867df9ad2652be3c77e0aee4a297d9d5ce7847f5f69a
font_01_sfnt_off0000606b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606B 18312 bytes
SHA-256: 08598633ecdc94b382a4e335ccefc5a7b6d358a9bcaaad09a03ae0d079369349

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