Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c62ae7622c15e92…

MALICIOUS

PDF

191.3 KB Created: 2012-03-31 20:17:04 +08:00
MD5: 50ecfbe523c7e3e4f3543a50fd999a99 SHA-1: ec09bd9a7462090f344c7adf04d07bd2e153f06e SHA-256: 2c62ae7622c15e925e975b37285ec1d5bd64be7d9169c2353acd568376ed38f9
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple suspicious characteristics, including embedded Flash content and a secondary embedded PDF. The presence of these embedded objects, particularly the Flash and the child PDF which itself has critical static findings, strongly indicates an attempt to deliver malicious content or exploit. The embedded URLs, while benign, are part of the document's structure. The overall structure points towards a multi-stage attack vector, likely aiming to exploit vulnerabilities in the viewers of the embedded content.

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
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 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://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0049_00.bin
719e412cd163bf797f9883e4b328ae92ceb3e209d4c9ccda9f844c068e017960		 pdf-objstm-decoded PDF /ObjStm 49 0 obj (inflated) 455 bytes
polyglot_child_pdf_off00027914.pdf
6f179514da54390c89df6d7cb200e013a6be68e2f593d3ebf7b00821c42ba9d0		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x27914 33811 bytes

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