Malicious PDF — malware analysis report

Static analysis result for SHA-256 b288fcd555531ce5…

MALICIOUS

PDF

46.7 KB Created: 2021-06-07 12:26:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bdaf8b28f541f4955225159abf9cb56f SHA-1: 890cc3aa6f0585debf2165fcce0e76fc5e00f497 SHA-256: b288fcd555531ce52fb132b6734b0f9eb7bb8e101626ecd82bd6bbf0893fdaed
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 0.9832

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-roblox-coding-guide-game-hack PDF link annotation
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/roblox-snowman-package-free_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/roblox-robux-hack-ad_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/roblox-bit-slicer-hacks_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/free-level-7-script-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/kazok-how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/free-roblox-swords_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/roblox-free-games-you-can-play_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/money-hack-roblox-galaxy_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/free-robux-website-real-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/buy-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/free-roblox-accounts-with-robux-that-work_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/has-roblox-been-hacked-2021_GM431946152.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • https://www.ezavysolutions.com/wp-content/uploads/fsqm-files/free-robux-today-youtube_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_004_off000055fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55FB 26196 bytes
SHA-256: 535624e9bb1af465d42bfaec982659bc91999daf0acbfd6ec17fa10204a23bb2
font_01_sfnt_off00009308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9308 18668 bytes
SHA-256: b2260d02fb42439e06d66d481478e3ff1175c44dcd8eb3f3eea93993c40b4b91

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