Malicious PDF — malware analysis report

Static analysis result for SHA-256 61520eb5fe4acd09…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 06:41:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c5f1f9eab88904fb89d64fb418ac13e9 SHA-1: 790c9ad4727f4d7427a69495392eb013ef0d0c92 SHA-256: 61520eb5fe4acd09ac18ab075c72be2697ae6c253534889dc56f78f204a4aa1d
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 0.9769

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/free-spins-for-coin-master-2021-game-hack PDF link annotation
    • http://libnh.stikesnh.ac.id/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-tiktok-followers-just-username_GM835599320.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/tiktok-free-book-website_GM835599320.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005411.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5411 24192 bytes
SHA-256: 835ee0c053f0ba4d8e26e4c1d1eb2c914ff2f0e01b7f50c7bcbd7591207db60c
font_01_sfnt_off00008b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4E 3124 bytes
SHA-256: a0e4a5f378f23ac829e40ef1a0638115ffab18b17acd7561ed9b637601232063
font_02_sfnt_off00009631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9631 18288 bytes
SHA-256: 66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217

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