Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac06c49e137653c1…

MALICIOUS

PDF

44.3 KB Created: 2021-06-04 01:22:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 90c22365f442b80f01f69d41cd20b71d SHA-1: 6b92f33aea7c01f96370a7ce361fd1d304242ab7 SHA-256: ac06c49e137653c1ca4dcb829f3dfcb4ed8518b7ba02c830efca6ce3da01dd6d
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 0.9865

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.online/app/431946152/free-robux-generator-2021-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/tiktok-free-2021-views_GM835599320.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://direct-link.netIn 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
font_00_sfnt_off00004f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F82 25052 bytes
SHA-256: 00131cc96c7aeaf5314dd43951474b0edf98f51b19a84d2b63af734969a770e0
font_01_sfnt_off000088dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88DC 18748 bytes
SHA-256: fca1806ffff7593a0a2d811b077fe14576afb362c0c2e8ffc695fbf8edc3964d

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