Malicious PDF — malware analysis report

Static analysis result for SHA-256 d137c574a79b0bb3…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 08:26:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 751ed937d3b9d5361c882045d755ceb1 SHA-1: dbce361138b48e6a40bf760621c4d189edb20764 SHA-256: d137c574a79b0bb3a2fb6db9ca58e890774d567ae8cd70b4db50aeeba42967dc
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 0.9865

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/406889139/coin-master-rewards-2021-game-hack PDF link annotation
    • https://tanahlot.id/assets/CKImages/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/robux-today_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/abd-roblox_GM431946152.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/can-pokemon-go-free-evolve-after-trade_GM1094591345.pdfIn PDF document text
    • https://tanahlot.id/assets/CKImages/files/roblox-character-free_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_off00005077.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5077 24476 bytes
SHA-256: 11948f9f77093f167cf9a8780d4e21a5b56a6f9ba7f22ccc10004e5830659053
font_01_sfnt_off000088fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88FB 18288 bytes
SHA-256: eeb8f608ee366a70186fb19656f115ef167c42b0d95b456a8493556d529e695c

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