Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe8d2abf6807bb1…

MALICIOUS

PDF

453.6 KB Created: 2011-04-18 15:20:20 +08:00 Authoring application: xyghPDF SDK 4.3 (via BCL easyPDF 4.30 (0615))
MD5: 6d5fb801b890bfa7cc737c018e87e456 SHA-1: 441cfe9d31d271262ff693e83daa1b4fefa0e2c4 SHA-256: afe8d2abf6807bb1b83affc20b8fcb424d75cb7ce340c900b59daeb9b3edc628
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.003 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious PDF

The PDF file contains embedded content and is flagged by ML classifiers as malicious. The presence of a secondary embedded PDF with suspicious static findings indicates an attempt to exploit vulnerabilities. The document body is unreadable, but the heuristics strongly suggest a malicious PDF designed to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8636

Heuristics 5

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0026_00.bin
0841ed6ca2149b386133777ff3868f6222ba5033d6f52cd654a117610818bd40		 pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 1084 bytes
polyglot_child_pdf_off0006fb25.pdf
4044524e0d63e7a8080f48c5c2ac2d90f174bca6a94b7529f245da6d43f70bcf		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x6FB25 6976 bytes
polyglot_child_pdf_off0006fe78.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x6FE78 6125 bytes

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