Malicious PDF — malware analysis report

Static analysis result for SHA-256 f369f549dfecda12…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 08:11:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ad9a76db9ca59e86a916c9d1b2ba5789 SHA-1: 24a03cfaf603810624c469414bc79d9b9e2540cf SHA-256: f369f549dfecda12f74870b1ea182e185ee2c7e3f05ebaa9ab06d109a5f350f4
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/how-to-get-free-robux-no-human-verification-game-hack PDF link annotation
    • http://oca.undil.tl/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/static-moonactive_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-net_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-script-injector-for-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/instagram-coin-master-free-spins_GM406889139.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_off000052af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AF 25732 bytes
SHA-256: f087a50479575e69b49b7eb398f3ec1bfbbb0c4d72413010d64a6cf1a1485f12
font_01_sfnt_off00008ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA4 19024 bytes
SHA-256: add4238412854312c544fb77f8d10d54d15c3f72dfb550af23f9090805c2c756

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