Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f79c6e2097c3b9c…

MALICIOUS

PDF

36.0 KB Created: 2020-04-25 18:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 442be340615cfd137de41d0713690ca5 SHA-1: 77e5c7f8870c063df6b7e606c4aec96517919c93 SHA-256: 3f79c6e2097c3b9ceb0d8529d64a9a5beb481370e170034ddd7aee94ee67a637
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, many of which are hosted on domains designed to appear as legitimate file-sharing or content sites. The document body text, though heavily obfuscated, contains a lure related to 'best piano book pdf' and references the wkhtmltopdf tool, suggesting it was generated programmatically. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a network of linked PDFs, likely for SEO manipulation or to host malicious content. The primary intent appears to be directing users to a network of potentially malicious or spammy websites.

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://youthcommunityproject.org/uploads/1/3/0/5/130539934/130539934.html#best+piano+book+pdf
    • http://chinatuna.net/uploads/1/3/1/3/131381589/goneni.pdf
    • http://retirementcrisisamerica.com/uploads/1/3/1/4/131437393/namonaj.pdf
    • http://byrafidah.com/uploads/1/3/0/4/130483773/funaleliwo.pdf
    • http://bondentertainmentservices.com/uploads/1/3/0/7/130739745/rigewubukibegoze.pdf
    • http://akizusushi.com/uploads/1/3/0/6/130604154/1e85e677.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_off0000648a.bin
58cf8f5c6b9ea5e93e1ca2d3e7d9feb160b5ee65068cf6d093da6e58f1ecc92c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648A 7908 bytes

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