Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c574071616ca86…

MALICIOUS

PDF

48.3 KB Created: 2021-05-17 17:07:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2b199b3b45daa81412fc19225f66fa5f SHA-1: 10fbd1f3b29fc944bc1f2b3689d7fb87c617d7b2 SHA-256: f2c574071616ca8695c4e2e88b96fc9b0d63d81d5a19fbb322966eaff09d7618
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 0.9013

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/free-roblox-accounts-with-robux-that-work-not-banned-game-hack PDF link annotation
    • http://immo360grad.com/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-game_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://immo360grad.com/images/collect-robux_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/oprewards-login_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/how-to-get-free-robux-fast_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
stream_003_off00004c93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C93 28288 bytes
SHA-256: 1610cb9f50ab377fb7df4ffdf245bc188ca8be849814b4b00dcf8863eed268d3
font_01_sfnt_off00008dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCA 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000097b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B4 19248 bytes
SHA-256: efa3c9b2c8f55d2ce8a78f8ae751aa117ac14b1934403b15023fd1527a527783

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