Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b8a0372d5f31f3…

MALICIOUS

PDF

33.7 KB Created: 2020-04-11 08:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 44ad59f403713f1aa687b28d9f85fa26 SHA-1: 4948d886464663cf3f995f717504c26198e39c7e SHA-256: b4b8a0372d5f31f36d8ff506c7af43a79ea33d4fe5b7017f981b69f2c938d694
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The primary URL found in the document body, http://gclub.lucky1st.com/uploads/1/3/1/4/131437656/131437656.html#cummins+insite+tutorial, is also part of this pattern. The file's purpose appears to be to distribute these links rather than deliver a direct payload.

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://gclub.lucky1st.com/uploads/1/3/1/4/131437656/131437656.html#cummins+insite+tutorial
    • http://shellydoggrooming.com/uploads/1/3/0/4/130489926/pawadapakijefenil.pdf
    • http://missouriwhitewatercenter.com/uploads/1/3/1/4/131437530/bizatonav_jusiwakud_lalapapuz.pdf
    • http://ahimsa.health/uploads/1/3/0/5/130542692/zeforiwogipap.pdf
    • http://we2gethertravel.com/uploads/1/3/1/4/131438449/a736af4f5501a7.pdf
    • http://homefromhomebandbwinchester.com/uploads/1/3/0/6/130604179/pimonew.pdf
    • http://barnesdrafting.com/uploads/1/3/0/6/130640107/zuboxe.pdf
    • http://thecrystallinecavern.com/uploads/1/3/0/4/130483583/xisew_vikeliwovewe.pdf
    • http://marshallsharp.com/uploads/1/3/0/6/130639385/7fe8855bfdf.pdf
    • http://falcon-cyc.com/uploads/1/3/1/3/131384015/9738690.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_off00005981.bin
bed19760005e7e06c0e4d022440aa4f3356912a3c06b40d1c04ef5e30d1154e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5981 8824 bytes

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