Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0885a4338a15f8…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 04:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0dcd34d4261dc15b488a4ea1776e0a9 SHA-1: d4a3ca1de4d65594099686c937be2166eb89bf43 SHA-256: 3b0885a4338a15f8e41f32f99c39132faeee9a6f7d978955702908c4f0635eb2
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. This URL is embedded within the document body, disguised as a link related to the 'EC Machinery Directive'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.ru/wb?keyword=2006/42/ec%20machinery%20directive%20pdf
    • http://files.irrigationvictoriabc.com/uploads/1/3/0/7/130775970/6483488da4.pdf
    • http://files.cassowaryday.org/uploads/1/3/1/4/131453022/fawuxuxabos_tudekapomuv.pdf
    • http://files.pierisproject.org/uploads/1/3/1/4/131408970/125264b.pdf
    • http://files.theglasgowgroup.org/uploads/1/3/1/4/131483318/laduf.pdf
    • http://files.ellyx.studio/uploads/1/3/1/4/131453574/49dc4d5cb49.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/44028578538.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1770/files/19263618646.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7099/files/4476032865.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/55687241372.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/sojinovasedikirejepanafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/zazufolevivobekiwutur.pdf
    • https://cdn.shopify.com/s/files/1/0433/4256/1433/files/7334930348.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9949/files/importance_of_audience_analysis_in_oral_presentation.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/83867801765.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e1.bin
975460561adadf553d60ee25826a0603580d88f724c3b4fb2d4d00808013cd8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E1 5804 bytes
font_01_sfnt_off00007886.bin
ab4c9fc4e78cd0ddbd2c3b52ddeaa87bd436c10eee77958781800a9ceabe4eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7886 10300 bytes

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