Malicious PDF — malware analysis report

Static analysis result for SHA-256 640a8516819ba6bb…

MALICIOUS

PDF

37.2 KB Created: 2021-05-20 23:12:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b597814bb0b4ecce0c1368380f627c5a SHA-1: 347b9e8f857ee6cd53a3e86af02ca71a12bf9935 SHA-256: 640a8516819ba6bb159eb12f32cabc8415b4afe800c88a527fcc4fd3bf57ccda
62 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a prominent call-to-action for a "Free Roblox Gift Card" generator, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a download button lure reinforces this assessment. The document's content and embedded links suggest an attempt to trick users into visiting malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-roblox-gift-card-game-hack
    • https://mme.itk.ac.id/asset/backend/upload/ckeditor/files/pubg-uc-buy-bd_GM1330123889.pdf
    • https://mme.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-with-no-verification-2021_GM431946152.pdf
    • https://mme.itk.ac.id/asset/backend/upload/ckeditor/files/free-spins-coin-master-apple_GM406889139.pdf
    • https://mme.itk.ac.id/asset/backend/upload/ckeditor/files/free-coins-on-coin-master_GM406889139.pdf
    • https://mme.itk.ac.id/asset/backend/upload/ckeditor/files/fb-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003303.bin
98b91e0c3374c9537b367bfc701e081db143a4cf5209451639485928eebe07d4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3303 25944 bytes
font_01_sfnt_off00006f5d.bin
d6dd878634c6e0bfa0573f8d07d8c04072d5223543faa3ff40eccc306bc8b9ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5D 18572 bytes

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