PDF malware analysis — malicious · ac4c49e0ac4b9b46

MALICIOUS

PDF

88.9 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: f567ffd4f7a19a469d836e5a0a9552ab SHA-1: 4c6c9ffbf66e0f9b1b26e76c18138cf8c0b670e8 SHA-256: ac4c49e0ac4b9b464836ac659b84e52c412e162fb56fda8c1adab5619398481c

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a screenshot lure, indicated by the PDF_IMAGE_LURE heuristic, suggesting a phishing attempt. It also contains embedded JavaScript and RichMedia (Flash) content, which are often used to deliver malicious payloads. The ML classifier strongly flagged this PDF as malicious. While no specific family is identified, the combination of these elements points to a common delivery mechanism for malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

Heuristics 9

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)
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 2 image(s), only 2 text block(s), carries a click-outward action, and is only 88 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
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 14

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
`objstm_0047_00.bin` `856830b101f28eaa61f2ccb44204fecaa2d0a9658055009fda363a9d3056ff76`	pdf-objstm-decoded	PDF /ObjStm 47 0 obj (inflated)	2543 bytes
`font_00_sfnt_off0000fa8f.bin` `9deb1b9f8d540749c7f959968d185dc976dc5754180de3407fbd6b0343327cc1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA8F	25632 bytes
`polyglot_child_pdf_off0000f487.pdf` `4e9b4f3ac714087558a4b2aabf1b43ec4b4c1ceb9d0fa2f796b44efe9ead68c4`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xF487	28411 bytes
`polyglot_child_pdf_off00014b93.pdf` `9a95102ad6b4d58a9a742832f61490a27e9b62855fe295b13214addfda321ad3`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x14B93	6127 bytes

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