Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6385858f2709c18…

MALICIOUS

PDF

45.2 KB Created: 2021-06-04 00:34:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e385beba6479855733f29e8a3a0c0d85 SHA-1: 017f45d5b7bc789b0594df74254f4e6ebd4a4f84 SHA-256: a6385858f2709c186ca2e9dd02b1d31753b9913d756f62f871a2fb7ba745efed
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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/free-robux-generator-for-roblox-2021-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ff2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF2 26300 bytes
SHA-256: 3fb77e2e88bc8916b48ff5356fad523adf913555c749f390d7116c1a373c961e
font_01_sfnt_off00008c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5C 18820 bytes
SHA-256: ebe9c90542e8fe2fea15c90130dc88571bff9717049b6ef0e566bae53a322baf

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