Malicious PDF — malware analysis report

Static analysis result for SHA-256 a633ab08dd94627e…

MALICIOUS

PDF

46.1 KB Created: 2021-06-13 17:52:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4bdccb3c0f511c1da3bc8bdd61dbd6ab SHA-1: 8969777d218977374f542e26e789b5a132276b68 SHA-256: a633ab08dd94627e47cb83145d6f628e4964244305bccb4f302d2dcff6bbb1a2
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a fake CAPTCHA and game hack lure to trick users into executing commands, likely to download a second-stage payload. The document contains multiple embedded URLs pointing to exploit-related content, suggesting a phishing or social engineering attack. No scripts were extracted, but the heuristics strongly indicate a malicious intent to deceive the user into running arbitrary commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 7

  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://netcdn.co/app/431946152/hack-roblox-account-kali-linux-game-hack PDF link annotation
    • http://pourvosvacances.com/images/free-exploit-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pourvosvacances.com/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/roblox-alone-free_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://pourvosvacances.com/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/robux-today_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/free-robux-poster_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://pourvosvacances.com/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/change-your-birthday-to-this-date-for-free-robux_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/robux-win_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/how-to-get-actually-free-robux_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/roblox-counter-blox-skin-hack_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pourvosvacances.com/images/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • http://pourvosvacances.com/images/proxo-roblox-hack-key_GM431946152.pdfIn PDF document text
    • http://pourvosvacances.com/images/paginas-de-hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E65 25228 bytes
SHA-256: 8ecb7a9d83ab14fe0cf9921666dfedbfb3b73b0aa23fdd1443e8166e24adb409
font_01_sfnt_off00008667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8667 2932 bytes
SHA-256: f0c3c7608f2d8a6c1ff2dbbeda48478663d2e454e76eacd924f860625fa2ee66
font_02_sfnt_off00009073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9073 18544 bytes
SHA-256: e1872e42663e73a920520215cad64213e64d7102fc4c537e5d0d8e816a9eda58

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