Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f95d8494ff52bd…

MALICIOUS

PDF

43.8 KB Created: 2020-04-06 14:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c64170a0e95ec87939614c1801fa677a SHA-1: aea3dc65637ccd19bf2794a8eefa1dda31cca476 SHA-256: d4f95d8494ff52bd58e44bcfca3119a16ae479884028dea8eeddc1f0b00b4dcb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm, likely intended to manipulate search engine results or distribute further malicious content through the linked PDFs. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://brakeactive.com/uploads/1/3/0/9/130969921/130969921.html#witches+cave+god+of+war+nornir+chest
    • http://lvnhomes.com/uploads/1/3/0/2/130289461/kazak-tuzonuxe.pdf
    • http://salesraider.com/uploads/1/3/0/7/130739463/lanokoferudakedajo.pdf
    • http://jenn-ventures.com/uploads/1/3/0/6/130621988/wewel.pdf
    • http://andarmanicouture.net/uploads/1/3/0/4/130483045/a226c307c31da.pdf
    • http://teambuildinginathens.com/uploads/1/3/0/2/130291030/2844399.pdf
    • http://amusicalgarden.com/uploads/1/3/0/4/130488500/426369be560acb.pdf
    • http://buer-englisch.de/uploads/1/3/0/4/130493389/95caf37e3dd.pdf
    • http://multiusefurniture.com/uploads/1/3/0/6/130603819/rareputosiz.pdf
    • http://krisotascakeshop.com/uploads/1/3/0/3/130379397/dakibepa-xujawaweruvim.pdf
    • http://westernnebraskapoet.com/uploads/1/3/0/7/130776680/jijemawem.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_off00008536.bin
61ae2adb625b3fd9b4cba8f36106252023bed69398638222267c0296fdfa7224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8536 7432 bytes

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