Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef5b2441dde8f93…

MALICIOUS

PDF

43.3 KB Created: 2021-06-04 01:53:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d87843cd7067f422a3bf1f01a0a830c3 SHA-1: fa87effeb7174b8c2411107de4c3e23f5424b897 SHA-256: 3ef5b2441dde8f93e9a70a87471f71d962338c9e0f7a9e0eddc2d3d297b3b1f7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document displays a fake CAPTCHA lure to entice users to click on a malicious URL. This URL, 'https://netcdn.online/app/406889139/does-coin-master-hack-work-game-hack', likely serves as a download or redirect to a second-stage payload. The ML classifier also flagged this PDF as malicious, supporting the observed attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/does-coin-master-hack-work-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-peoples-account-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/my-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-free-download-2021_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/google-how-do-you-get-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
stream_004_off000050c0.bin
5995c9bb3f6c7c81b88ab21dee72f1a41fa167bbd22f1b9b94606a2f6bcdd9be		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C0 24176 bytes
font_01_sfnt_off0000873e.bin
4cea799240287eb948bae7a48ce350820d898f3c74ec39daa0da77041a3d74b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x873E 18084 bytes

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