Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f191aa61c4e92f…

MALICIOUS

PDF

44.7 KB Created: 2021-06-02 17:17:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8d2742e7b2e1e8e1ef63de7f82f6cd20 SHA-1: 8b59980e6d2c299a1bccb0b994dfa1e721e585e6 SHA-256: b3f191aa61c4e92f87570745e7f3eb2c8b697876beeea65e2f70fde81155ab3e
122 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and game hacks, presenting a fake CAPTCHA to trick users into clicking a malicious link. The embedded URL leads to a website that likely serves as a redirector to further malicious content or exploits. No scripts were extracted, but the PDF structure and heuristics indicate a social engineering attempt to drive user interaction towards a potentially harmful external resource.

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.xyz/app/431946152/best-free-robux-sites-2021-november-game-hack PDF link annotation
    • http://santeh-40.ru/images/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/free-followers-on-tiktok-no-human-verification_GM835599320.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://santeh-40.ru/images/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://santeh-40.ru/images/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://santeh-40.ru/images/pubg-uc-cheap-price_GM1330123889.pdfIn PDF document text
    • http://santeh-40.ru/images/how-to-hack-roblox-plaza_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-hack-app_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_off00004f4f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F4F 25348 bytes
SHA-256: c956d2db5ec2c5c67da49e9c07716b4692e3c704e6a3d1661011fa862309c7fa
font_01_sfnt_off000089b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B3 19016 bytes
SHA-256: e81a15c28d2a774e00e34a9c7185c60ee257cd059bff0146cc4dca60126cc865

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