Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c94ea5fc82890eb…

MALICIOUS

PDF

43.1 KB Created: 2021-06-07 17:45:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 48176a476eb1e334c63620c472ede0c6 SHA-1: c5dc22a21a57f9b44d508282087f70ff42a4e6e1 SHA-256: 3c94ea5fc82890eb23f72d8d45441543393287db339c2218e9b51561b60addd6
122 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking a link, likely to a game hack or promo code generator. The embedded URL, https://netcdn.tw/app/431946152/free-promo-codes-roblox-list-game-hack, and numerous other URLs hosted on ivanitskyvs.ru suggest a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.tw/app/431946152/free-promo-codes-roblox-list-game-hack PDF link annotation
    • http://ivanitskyvs.ru/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/free-robux_GM431946152.pdfIn PDF document text
    • http://ivanitskyvs.ru/images/www-free-robux-hack-generator-club_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
font_00_sfnt_off00004c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C62 24880 bytes
SHA-256: 1f6486b5e64a3aba65dd36c6adcea2cb1e97730ecfbc4ca4c49ff47e1f89afef
font_01_sfnt_off00008472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8472 18760 bytes
SHA-256: 350c35eee7f25a1ac4bab35079f52fd8be44ef23fd6f758aafcbfc0954669179

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