Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcf4deaeee5d67b…

MALICIOUS

PDF

34.5 KB Created: 2021-07-20 11:06:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5ef4192ecb3f72bd0d4f3351c702c9d0 SHA-1: 0082d78e528c4d70a8f5a7b3679f8d168c8b1617 SHA-256: 9bcf4deaeee5d67b3650212358fe2eee9068b8f57510f7b9a9d69b0f2efe66a8
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into downloading a file from the URL http://netcdn.tw/app/479516143/minecraft-bedrock-free-game-hack. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious PDF files further supports this. No scripts were extracted, but the document's structure and embedded links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://netcdn.tw/app/479516143/minecraft-bedrock-free-game-hack PDF link annotation
    • https://engelum.com/images/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://engelum.com/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://engelum.com/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://engelum.com/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://engelum.com/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://engelum.com/images/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • https://engelum.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://engelum.com/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://engelum.com/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://engelum.com/images/rbx-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_off000031a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A1 23044 bytes
SHA-256: f208bf08aa6fc13ae0fa17b304cde3dd9d793c180a3acb0ca14488409e224f5b
font_01_sfnt_off00006533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6533 18268 bytes
SHA-256: 421dc37018d5e6f1467ffbccbacebf5894202cb157ac672e86022266516fa266

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