Malicious PDF — malware analysis report

Static analysis result for SHA-256 466d3a3a1247407a…

MALICIOUS

PDF

296.2 KB Created: 2011-04-18 15:20:20 +08:00 Authoring application: pdfFactory Pro www.fineprint.cn (via pdfFactory Pro 2.53 (Windows XP Professional Chinese))
MD5: 2a12a11fe5b8bde507bf69d4c2d5898e SHA-1: 4db348236b4a3ee1a3b94a7d42a5676582a9f5f0 SHA-256: 466d3a3a1247407ae719217cf402f83029983b9ca1589e196afd725e3e55fcb5
114 Risk Score

Malware Insights

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

The PDF file contains embedded objects and a rich media (Flash) stream, indicating an attempt to exploit vulnerabilities. The presence of a secondary embedded PDF with suspicious static findings further supports this. While no specific script was extracted, the overall structure and heuristic firings suggest a malicious PDF designed to download and execute additional payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2654

Heuristics 6

  • 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)
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.fineprint.cn
    • 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 9

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
font_00_sfnt_off0001f005.bin
13bfa8b3407e7e43016b279bb44dbd3af276c040d0850773bfbd5f048e7151d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F005 47096 bytes
font_01_sfnt_off0002514c.bin
6b806821661663752e1fb0a5ec8460912fc48afbb96bcda8b534c38e42c8bbb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2514C 72632 bytes
font_02_sfnt_off0002e69f.bin
bbb9860d3821b18d6f1b8f7921a328357496f6f042e1d2f1998d8a75ad52a5f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E69F 73604 bytes
font_03_sfnt_off00037ae3.bin
1c0f7d41349a1ec1832d15285c80c39e58a6dbcbc1df83d4effdee1a10aeaee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x37AE3 59240 bytes
font_04_sfnt_off0003f2a6.bin
7008dc437a4bfba3691ade8a7a232bf5504705eb03b7a0900a60db5863687ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F2A6 68508 bytes
font_05_sfnt_off00047b50.bin
da221eaf9c0703b15f52b4a6970fa71a439df3d18f75c8d84d8a42bde6044dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47B50 3200 bytes
polyglot_child_pdf_off0001cb1d.pdf
ee523d26e93d73fb8d18f2fb120821d72ef49c043cddb9b4368894a9be44dfd7		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1CB1D 185796 bytes
polyglot_child_pdf_off000488f4.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x488F4 6125 bytes

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