Malicious PDF — malware analysis report

Static analysis result for SHA-256 404a649f331dc566…

MALICIOUS

PDF

36.9 KB Created: 2020-06-02 14:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a13f4b5df04e611ef80a06bec03b0c37 SHA-1: 77b71be071bf7164adf9ad45ec90f6fd3b349a0f SHA-256: 404a649f331dc566533e2354782d715129f1689b246e57dd0be8ec4f68e4fe51
92 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of external links, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to 'Exercicios de porcentagem simples' and embeds numerous URLs pointing to PDF files on various domains. This suggests the primary purpose is to redirect users to a network of external sites, potentially for distributing more malware or for malicious SEO purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://lag-architecture.studio/uploads/1/3/0/5/130590589/130590589.html#exercicios+de+porcentagem+simples
    • http://naccsk-12.com/uploads/1/3/0/6/130605351/vivusixipawe.pdf
    • http://toxinscreen.com/uploads/1/3/1/3/131398356/jenilunivi.pdf
    • http://theseven16live.com/uploads/1/3/0/8/130874205/bamema-mapimowuji.pdf
    • http://pacificislandpools.net/uploads/1/3/0/5/130551795/a01a5.pdf
    • http://aidshirt.com/uploads/1/3/1/4/131408209/8571332.pdf
    • http://vanilla-green.com/uploads/1/3/0/6/130639337/4b84a66.pdf
    • http://lag-architecture.studio/uploads/1/3/0/5/130590589/terms.html
    • http://lag-architecture.studio/uploads/1/3/0/5/130590589/dmca.html
    • http://lag-architecture.studio/uploads/1/3/0/5/130590589/policy.html
    • https://zizixabaga.files.wordpress.com/2020/05/famupaxiwabasezemi.pdf
    • https://vudilofifo.files.wordpress.com/2020/05/lototiruvivemanuki.pdf
    • https://badupegenum.files.wordpress.com/2020/05/jizaxuwogexixifevosun.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_off00005ee6.bin
9b555ba7cac7f0df53924f2c4444557d0184a42b78723a375b7f5288ae360339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE6 12960 bytes

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