Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bbba480fc44c3d…

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)) First seen: 2013-08-24
MD5: b412fcdfcdb2c51f6acec10be6aa474b SHA-1: 497a64fee16b6b449f0aa165acc31398fd51074f SHA-256: c5bbba480fc44c3dc0910f4bc024ebb31c8f618769b191a9e62eac8cb1e953db
204 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF document contains an embedded Adobe Flash object that exploits CVE-2011-0611, a known vulnerability for client-side code execution. The embedded Flash content likely serves as a dropper for a secondary payload. The presence of a polyglot child PDF further suggests a multi-stage attack. The primary IOC is the SHA256 hash of the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5792

Heuristics 7

  • Adobe Flash Player RichMedia exploit critical CVE likely CVE_2011_0611_FLASH_RICHMEDIA
    PDF combines RichMedia Flash activation with an embedded AS3 SWF loader (ByteArray/loadBytes) and shellcode heap-spray staging. This is the static exploit shape associated with CVE-2011-0611 Flash content delivered through Adobe Reader.
  • 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 PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0026_00.bin pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 1084 bytes
SHA-256: 0841ed6ca2149b386133777ff3868f6222ba5033d6f52cd654a117610818bd40
font_00_sfnt_off0001f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F005 47096 bytes
SHA-256: 13bfa8b3407e7e43016b279bb44dbd3af276c040d0850773bfbd5f048e7151d9
font_01_sfnt_off0002514c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2514C 72632 bytes
SHA-256: 6b806821661663752e1fb0a5ec8460912fc48afbb96bcda8b534c38e42c8bbb1
font_02_sfnt_off0002e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E69F 73604 bytes
SHA-256: bbb9860d3821b18d6f1b8f7921a328357496f6f042e1d2f1998d8a75ad52a5f1
font_03_sfnt_off00037ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37AE3 59240 bytes
SHA-256: 1c0f7d41349a1ec1832d15285c80c39e58a6dbcbc1df83d4effdee1a10aeaee3
font_04_sfnt_off0003f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F2A6 68508 bytes
SHA-256: 7008dc437a4bfba3691ade8a7a232bf5504705eb03b7a0900a60db5863687ecb
font_05_sfnt_off00047b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47B50 3200 bytes
SHA-256: da221eaf9c0703b15f52b4a6970fa71a439df3d18f75c8d84d8a42bde6044dfb
polyglot_child_pdf_off0001cb1d.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1CB1D 185797 bytes
SHA-256: 3fa355236a66251a411451a122c3525092bbefe31313f72e82d9cfa067c4ada5
polyglot_child_pdf_off000488f4.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x488F4 6126 bytes
SHA-256: 3dcf75e976520c1a471383d9ef600b558c288cc5af7914b4eb8a8319fb78a9be

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