Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1dc658d7500225…

MALICIOUS

PDF

51.9 KB Created: 2020-04-05 09:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 69fe9f2057e74232fa2d3848690c8682 SHA-1: dac633d5b94050bfc23370f3bad8186defeb5171 SHA-256: aa1dc658d75002258bc490e0486c490e06e60d7f632557dac0c950055c802441
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains with numeric slugs. This pattern is indicative of a link farm or SEO spam campaign. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. The document body contains garbled text and a URL that appears to be the primary lure, suggesting the document's purpose is to direct users to this network of sites.

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://cliffviewpublishing.com/uploads/1/3/1/4/131454731/131454731.html#lewis+dioxido+de+azufre
    • http://lwchouma.com/uploads/1/3/0/5/130588443/9049887.pdf
    • http://maisconsultoria.net/uploads/1/3/1/4/131406985/lazofan.pdf
    • http://householdpartners.com/uploads/1/3/0/2/130289695/d50f3e0d4b.pdf
    • http://stoutheart-focusedmind.com/uploads/1/3/0/2/130270740/xejavew.pdf
    • http://buyrefugeecandles.com/uploads/1/3/0/7/130776034/gopenaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f4b.bin
af2f5f82d3a2b96dea2ab93a4e219b983c7b3fa4ba328d94cf5fabb390e5b4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4B 9124 bytes
font_01_sfnt_off0000a031.bin
f203a645e29e45a58fd1791438accd7d4148ca4524620caef7dc6534e94f854b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA031 3368 bytes
font_02_sfnt_off0000ac03.bin
8b6eddb252e0aa127c2b3a0123b7550ea08663edd489d6c02821d42989bc7872		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC03 16128 bytes

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