Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b80dd81c7da1b25…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 04:57:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 81b5a979ae293f1a892f7f5584b5ad1e SHA-1: 16e6caa6823c24f72fe016e606b57fb6a5cbfcfa SHA-256: 0b80dd81c7da1b259e4b20da24fd43664b59551d6515fda6191fd8f4ab034cb6
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/479516143/minecraft-free-ios-no-verification-game-hack PDF link annotation
    • http://oca.undil.tl/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-bobux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/why-is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/microsoft-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_off00004ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED7 25220 bytes
SHA-256: 1b5c33f77513fc342be18b4e769ba86432139aabc8296813b7e3a1154a2160ea
font_01_sfnt_off00008813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8813 17844 bytes
SHA-256: 314c8825a4d06e03bd849bd4cad10bf883abec19d637afa4c41587c94f1a0a3d

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