Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7b6d112f76ef9e…

MALICIOUS

PDF

45.9 KB Created: 2021-06-04 05:18:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 779513829bb2de556289fbf8f3b6b889 SHA-1: 6674a31ab8b5961cbddb6654ca4f645f93b4da81 SHA-256: 3f7b6d112f76ef9e6bc328b6e30c852ae780d3d0851c72aed3572b8ab246930d
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It also contains an embedded URI pointing to a URL that appears to be a download link for game cheats, further supporting the lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.online/app/431946152/how-to-noclip-on-roblox-with-cheat-engine-2021-game-hack PDF link annotation
    • http://library.gkigadingserpong.org/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/rbx-sites_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/tiktok-followers-generator-free_GM835599320.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_off0000524d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x524D 25288 bytes
SHA-256: 64d61b92f54539ab0d4c0014e0ec051809d1829cab782327f0e110b0e182acba
font_01_sfnt_off00008c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C88 19628 bytes
SHA-256: 1871dfa5dcc3a57cc94e4a5a3a9e508c2fbd0ec1d586fe58fdd96cff87433076

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