Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb50f920a469bf8…

MALICIOUS

PDF

553.2 KB Created: 2010-03-31 12:55:11 -04:00 Authoring application: Adobe InDesign CS4 (6.0.4) (via Adobe PDF Library 9.0)
MD5: 3807f1ab26b12c466c9a6264f23facdd SHA-1: f220fbc67c9e734d2ecce1b01e8c3675657b02f1 SHA-256: bcb50f920a469bf8395009d019d4057c2fa084cbef11287035c707cb0e33ed50
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits suspicious characteristics, including embedded child PDFs and remote GoTo actions, as indicated by the PDF_EMBEDDED_CHILD_STATIC_TRIAGE and PDF_GOTO_REMOTE heuristics. The ML classifier also flagged it as malicious with a high score. While no scripts were extracted, the presence of embedded files and remote actions suggests a multi-stage attack designed to deliver further malicious content or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8662

Heuristics 4

  • Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE
    PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • Remote GoTo action info PDF_GOTO_REMOTE
    PDF has GoToR/GoToE actions that reference sibling document files — typical of multi-part document bundles
  • 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/xap/1.0/g/img/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/sType/ManifestItem#
    • http://ns.adobe.com/xmp/InDesign/private
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/t/pg/
    • http://ns.adobe.com/xap/1.0/sType/Dimensions#
    • http://ns.adobe.com/xap/1.0/g/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
bode_sun_192.pdf
db8ae52132b2fd79305f50140db5a664f4d3a71f1d8e8121997786b9ea672a48		 pdf-embedded-file PDF EmbeddedFile object 244 at offset 0x1A9DF 224059 bytes
bode_sun_192_1.pdf
91e44f493ee08f6b7730058754e701c08c777ea24ebd3a57401464aa1c02ee47		 pdf-embedded-file PDF EmbeddedFile object 244 at offset 0x1A9DF 310556 bytes
bode_sun_192_2.pdf
ef336edaa6d8ec8edef2352b399a2af661742dc23c7dc2187d9943729be54af0		 pdf-embedded-file PDF EmbeddedFile object 244 at offset 0x1A9DF 397003 bytes
objstm_0121_00.bin
273d9308a20122c09abbf75f2017e304fdef204d2cb09c81c195425332b6c831		 pdf-objstm-decoded PDF /ObjStm 121 0 obj (inflated) 1102 bytes
font_00_cff_off0000b46d.bin
38d7d0627d6ef08fdb595be75f8f12752f3381fa7a1441ca8f76a5e76dc6e7b9		 pdf-font-stream PDF embedded font (cff) at offset 0xB46D 609 bytes
font_01_cff_off0000ba3f.bin
5f3f348279f5218a0f3607c4a8e7c1b2190742072e04b58112191aa6b4235f52		 pdf-font-stream PDF embedded font (cff) at offset 0xBA3F 886 bytes
font_02_cff_off0000c1e7.bin
7e5cb310f6cb7822b8a316192e8347738bb3f1d76fe954bdbf17623d2e87f2fb		 pdf-font-stream PDF embedded font (cff) at offset 0xC1E7 3808 bytes
font_03_cff_off0000d457.bin
99bc093cddfa13f76f619bedeaf723ce24882a341f9686e35da3cad8dbab0a72		 pdf-font-stream PDF embedded font (cff) at offset 0xD457 3669 bytes

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