Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee17125f2d000327…

MALICIOUS

PDF

46.6 KB Created: 2021-06-11 02:00:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: be75717388f85451bbaea0563b28711a SHA-1: 1b1810e20a21a210132333ba13744b543f46cf27 SHA-256: ee17125f2d0003275b20776f12daa6a95413400cc702fa07e8f83f8ef018eab8
182 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 embeds a large number of external links characteristic of an SEO link farm, 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 0.9832

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/roblox-glitches-and-cheats-for-lumber-tycoon-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-g_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/gold-cards-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-as-a-kid_GM431946152.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_off0000538d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x538D 26620 bytes
SHA-256: 84085b8411d2ca51c851af195937e3e67e724ee65cf57764f47b05dcbfbf4bae
font_01_sfnt_off000090df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90DF 19320 bytes
SHA-256: a44ed8c03f03db541a127f67b1bcd132fbf70c3238afe705ae71f34377285162

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