Malicious PDF — malware analysis report

Static analysis result for SHA-256 b352d83d2083a6c6…

MALICIOUS

PDF

44.8 KB Created: 2020-05-19 11:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a677de4d1d6373f0494cbbf86e9d2441 SHA-1: 1a2d61ab6c431fbf37c9eca926012da285b64498 SHA-256: b352d83d2083a6c64270acf6c269fdd6b22fcff2e6d22b3a4a810119ee0e6cd5
92 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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious. The primary function appears to be acting as a link farm, likely to distribute further malicious content or for SEO manipulation, rather than containing a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://masonleigh.com/uploads/1/3/1/3/131379443/131379443.html#cave+story+porn
    • http://affordablespeedyscreens.com/uploads/1/3/0/2/130272610/lonenokazufadige.pdf
    • http://selfmadegoddesses.com/uploads/1/3/1/4/131455378/7408474.pdf
    • http://allaboutcleaningandorganizing.org/uploads/1/3/0/8/130813582/26b2d4.pdf
    • http://apurvamehta.info/uploads/1/3/0/4/130436450/vodosorujuxos.pdf
    • http://bangbarvt.com/uploads/1/3/1/6/131636839/60d0ac5f95e4.pdf
    • http://cellmark-se.com/uploads/1/3/0/7/130740356/tanujuwesib_wozoxezuf_xeginaxonepil_bikusuf.pdf
    • http://sarahsullivanwriter.com/uploads/1/3/1/1/131164118/labisikuxapulisaw.pdf
    • http://legacyvapedistribution.com/uploads/1/3/1/0/131069910/vunali.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_off00006cdc.bin
3b16ff44bdd305e8a43f313e7c4fde1767eed6beae1c27dc124a3731f3dba712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 6672 bytes
font_01_sfnt_off0000806d.bin
7a12dbb6c9876686ec29eb82756af989f6db14a168690711b0383f8240997941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806D 12584 bytes

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