PDF malware analysis — malicious · f709d4ccd18c1662

MALICIOUS

PDF

294.7 KB Created: 2011-09-20 10:38:42 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))

MD5: 08cdc6213d63ea85fbccd335579caec4 SHA-1: 695296be53cb07a847a289ea389897d67c379f3b SHA-256: f709d4ccd18c16626bdeffbaa81b0b15e80c868758cf53fe68e6ee076f8c0325

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript and RichMedia (Flash) content, indicating an attempt to exploit vulnerabilities or deliver malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of multiple embedded files further suggests a multi-stage attack, likely designed to download and execute a secondary payload. The benign URLs present do not detract from the malicious indicators.

Machine Learning

Nyx PDF Classifier malicious score 0.9548

Heuristics 8

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
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic (matched inside decoded stream)
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.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 15

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0001.bin` `3000b3469a8bd553f177da3f507a5ea2271a3dee1fd5d5343f41950837af583c`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x3B36	163 bytes
`embedded_file_obj0002.bin` `66b82b096ae83103365f40b9b767a5582b0a497e4589e7b9323eac0320c61808`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x3C27	1670 bytes
`embedded_file_obj0003.bin` `e763ac63c3d21786709e7f462b463575525d0e344202f42dbb96897a01541e78`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x3F43	785 bytes
`embedded_file_obj0004.bin` `720c47f19e6a058099295d18a16b7149cc73fe497eb78821ea810f3192228dc4`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x4138	150 bytes
`embedded_file_obj0005.bin` `c8a82f67dfd8d68c2f8fe494ca2deee4604701c8f02863bf87d222b992e45de9`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x4209	2955 bytes
`embedded_file_obj0006.bin` `4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x4583	200 bytes
`embedded_file_obj0007.bin` `4273cd319df227c91b92e5509527bb4f6e1abfb3aa2beec2fb2adb93a8671f62`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x4676	835 bytes
`embedded_file_obj0008.bin` `4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x484D	56 bytes
`stream_002_off000003ed.js` `529357503ec67b623d2a12816cdeea62bd639f2b4ff4e568b01c96cc3f5bfc6f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3ED	1363 bytes
`stream_003_off000005ca.js` `e985b5df65c8c3cf732a9074b575fbc594c1c7f0bccc0994182ec7e5c0f7308a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5CA	902 bytes
`stream_029_off00012aca.bin` `08149cb409b8d2fa03186e381334dc0e41d7d07b620ac1b50b0a11578cbd2590`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x12ACA	348604 bytes
`objstm_0047_00.bin` `856830b101f28eaa61f2ccb44204fecaa2d0a9658055009fda363a9d3056ff76`	pdf-objstm-decoded	PDF /ObjStm 47 0 obj (inflated)	2543 bytes
`font_01_sfnt_off000302a1.bin` `4c542038ff8c885d10f1c2e0787db6e9e37fc121180383fd1f9e8475fc0c65d1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x302A1	27356 bytes
`polyglot_child_pdf_off0000f48b.pdf` `0715cb741a5c9a6f82f873e8066584f2b733d328cf1ea678ad4b201ef65d79d9`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xF48B	239199 bytes
`polyglot_child_pdf_off000482fb.pdf` `9a95102ad6b4d58a9a742832f61490a27e9b62855fe295b13214addfda321ad3`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x482FB	6127 bytes

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