Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6896b1522dfcbe…

MALICIOUS

PDF

29.3 KB Created: 2020-05-14 00:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ddabbd1131e0bc5f46960d04c8fba539 SHA-1: 19e40d001720b42d7d91728dbcb4c4f6e4ef213f SHA-256: cc6896b1522dfcbeafe4e4ebdde31481753ce78e5396772dc790b1d534685181
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file exhibits characteristics of a link farm, with a heuristic firing indicating a mass of external PDF links. The ML classifier strongly flagged this PDF as malicious. The embedded URLs point to numerous PDF files hosted on various domains, suggesting a coordinated effort to distribute content or manipulate search engine results. No scripts were extracted, and the document body is largely unreadable binary data, making it difficult to ascertain a specific user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelayographics.com/uploads/1/3/0/2/130272389/130272389.html#cadmium+melody+song
    • http://sunriseshores.info/uploads/1/3/1/6/131606331/tixuwevagijoxig.pdf
    • http://northernadventure.org/uploads/1/3/0/4/130477192/6480673.pdf
    • http://new4ucleaningservice.com/uploads/1/3/0/7/130775992/sebarivasazoda-nated-rokapavuvitem.pdf
    • http://radventuresbuilding.com/uploads/1/3/1/4/131454537/6e8e4258380.pdf
    • http://redhoneydew.com/uploads/1/3/1/6/131607075/zosuvaru.pdf
    • http://autokarynowasol.pl/uploads/1/3/1/3/131378990/9539059.pdf
    • http://boostbabybetter.org/uploads/1/3/0/2/130287229/zulajirik.pdf
    • http://alloexo.club/uploads/1/3/1/6/131606697/293d8a18.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a71.bin
d56e04e7c9f2654a6730225b5aed3cc7321f4ddbff471931a7d0463fa9415e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A71 9816 bytes

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