Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8c0aa7754d19fa…

MALICIOUS

PDF

44.6 KB Created: 2021-06-09 14:34:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3d4761d2bc24b5e0db3d7bd752e21f4e SHA-1: 24965569659549ad63ec4424570c4d7b374d9cc6 SHA-256: ac8c0aa7754d19fa4f6f4b257aec26c27ad10a13ca96f0bdd2caf1c713afb64b
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 0.9865

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/como-hackear-cuentasen-roblox-game-hack PDF link annotation
    • http://bressanassessoria.com.br/images/roblox-prison-break-cheats_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-to-use-roblox-shirt_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-generator_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/tiktok-views-free_GM835599320.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/comment-avoir-des-robux-gratuit-sur-pc-hack_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/robuxlove-net-free-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
font_00_sfnt_off000051a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51A2 25124 bytes
SHA-256: 15ea23fce93a1580fcb1a3db646de619b9326400b4d49a8d5c3cdeda51a94164
font_01_sfnt_off00008a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4C 18684 bytes
SHA-256: 0d231f1601fb1830581e2bcdf1a1ca9d82244e5b495c4b2f7e43b82d82df6997

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