Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6df8357f186c77…

MALICIOUS

PDF

42.3 KB Created: 2021-05-12 19:34:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5c72257812d933602ece2ffa87bca2b2 SHA-1: fefd98113e494ec9673303f8f6227b340e1d10c6 SHA-256: bb6df8357f186c7766621c1a9a7d387ea5124e242f43f75f80b51fe15bfbcaca
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 0.9971

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/is-roblox-studio-free-game-hack PDF link annotation
    • http://nebraskahospitalityhalloffame.com/images/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://nebraskahospitalityhalloffame.com/images/op-rewards-robux_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_003_off00004a78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A78 24652 bytes
SHA-256: 1477023c8d9469d342f6d2a0ff5dc0ae25c3179b84407b4cc606ca6626e57b9e
font_01_sfnt_off00008260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8260 18484 bytes
SHA-256: 8c5b4094469af548f1fa9842e12df6aaf158939a09e061110ae6a0a8023b94b8

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