Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eeea0ae98666f1…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 05:22:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 25c61b2e3aa51119f55565142936c9aa SHA-1: 2fd593ab09342bdbe98631cfc4bc8ab73b795ca7 SHA-256: 21eeea0ae98666f171f263fc0a36b5a310a3d0423beb9d6d9bc47449ea3aa593
182 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 fake-CAPTCHA lure and a seed-phrase/secret-recovery 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 0.9865

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/filter-roblox-hacks-game-hack PDF link annotation
    • https://lib.stie-yai.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/dlc-script-hack-roblox_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-fun-com-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_004_off00004edc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EDC 24432 bytes
SHA-256: 45615c4ec4680672101aae9c171ae4d094a038d2a9457e6a31e605289024ed3a
font_01_sfnt_off000086f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F5 18568 bytes
SHA-256: 54e4fcc90bff526b8a22a727aff7aa8b2b2a712f62f23a022931e4322d5357af

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