Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0b20c450fc1940…

MALICIOUS

PDF

48.5 KB Created: 2021-06-03 06:26:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 977a16c832e3df75d2b0922bc3192f90 SHA-1: fd9afd5b0c176b41a0cc6547d9939e02fcf6f3cc SHA-256: 4c0b20c450fc19401e74d9cfd540e7d9c9e5f50329a36a3fa9afee96818cf5af
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 0.9796

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/free-script-executor-roblox-game-hack PDF link annotation
    • http://oca.undil.tl/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/village-coin_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/static-moonactive_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005165.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5165 26436 bytes
SHA-256: 4248f634616c6d7dd92fed560f847b33a91594d2a194fd3b61b645722eabe61b
font_01_sfnt_off00008d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D62 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A74 18488 bytes
SHA-256: c1d8906df7cfed201442eecb2c05ff4a638972dd76746327367067a9273c3e32

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