Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2a08c649e669c4…

MALICIOUS

PDF

38.3 KB Created: 2020-04-06 15:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d4d6e65e3e25182cfb7e831e169cb71f SHA-1: 5d79e6f402771a876ec615fee70cac5107228585 SHA-256: 8b2a08c649e669c40ace882626ce9a5391618b7bbbf0b1d87b786596bf1ec6de
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious content hosted across multiple domains. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xocobean.com/uploads/1/3/0/2/130272488/130272488.html#reflexiones+para+estudiantes+de+secundaria
    • http://spreadlovelivepeace.com/uploads/1/3/0/8/130874381/3414768.pdf
    • http://douglasmcferran.com/uploads/1/3/0/7/130740224/reduwodepe_kesiz_dizalijireduw.pdf
    • http://ntkdomains.com/uploads/1/3/0/7/130776085/xupefedesi.pdf
    • http://aiosdagurgentie.nl/uploads/1/3/0/6/130604748/luponixamepitiw.pdf
    • http://themedeventsbymelissa.com/uploads/1/3/0/5/130551890/37b833.pdf
    • http://merbeinhistoricalsociety.com.au/uploads/1/3/1/3/131398385/lojiw.pdf
    • http://ssmonogramsonline.com/uploads/1/3/0/6/130640208/turozoz.pdf
    • http://aaainsureus.com/uploads/1/3/0/7/130775520/vageron.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_off00006a63.bin
6b4efb26dbe728ea38a1a3405ecc71984b28955cde9c20798d27b7e4354ec5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A63 8884 bytes

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