Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9c5befbb06d3fb…

MALICIOUS

PDF

36.5 KB Created: 2021-05-21 12:40:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 74a1e2deca3c3c85525d4e2f9197cdcd SHA-1: 854f2fade657cf2f56ed2442d01fbf665d8b5f78 SHA-256: ad9c5befbb06d3fb6f293bd363c58d66d2ad44d2fa73b1f9c033475cd6bdb5fe
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick users into downloading a file from the provided URL. The document body and embedded links suggest a theme of free game hacks and downloads, which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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.xyz/app/431946152/synapse-roblox-free-download-game-hack PDF link annotation
    • http://riccardodurso.it/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://riccardodurso.it/images/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://riccardodurso.it/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://riccardodurso.it/images/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://riccardodurso.it/images/how-to-get-roblox-premium-for-free-2021_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_002_off00003212.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3212 25008 bytes
SHA-256: 16bf8df5d3b5dca6dd48d37ed431f228d12149bc36aba9cce6665de86ddb0f81
font_01_sfnt_off00006abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABB 19036 bytes
SHA-256: 893248d405b3cd6ab4cc16169dbaa725a15df4f046ef9721aa1aaf04f233e0f3

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