Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ab303468ca2afe…

MALICIOUS

PDF

34.2 KB Created: 2020-05-16 14:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3de1e20b7c6ebe365c8971d3b2ae62 SHA-1: bd78921fda074543b9f08cf62b054d6d99e270da SHA-256: b0ab303468ca2afe10c8faff42f782fc91f7ff329987df999e0e6befb797dfa8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains URLs that are likely part of this link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern appears to be SEO spam or a link farm designed to redirect users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://yaredimmtratax.com/uploads/1/3/1/3/131398085/131398085.html#chashme+ke+photo
    • http://bakingandbaskets.com/uploads/1/3/0/6/130621051/tunagifej-pilagife.pdf
    • http://kittysfantasies.com/uploads/1/3/1/8/131871780/3401ea0705.pdf
    • http://womenincircusnetwork.com/uploads/1/3/0/6/130639531/986316.pdf
    • http://mediasunwin.com/uploads/1/3/0/6/130639983/widoja.pdf
    • http://picassospizzallc.com/uploads/1/3/0/6/130639258/totuwumig.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_off00005c33.bin
4cb0707c7baf348ede790e691f41168a370aa2df2d9ad15ef3cf8e3c68f9ac2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C33 10120 bytes

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