Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d50828d3b4455b3…

MALICIOUS

PDF

43.0 KB Created: 2020-04-10 20:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a56d33e70d69aece7311a33e8a453424 SHA-1: 7662d2bc07e4894824de8147dad47a21e97a798f SHA-256: 8d50828d3b4455b3504ab592faf125ac66e6c1ec31ae2cc78c9c52cdbee34c5b
92 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 distribution mechanism. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. No scripts were extracted, and the document body is heavily obfuscated, but the primary function appears to be directing users to a network of potentially malicious or SEO-abusing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://thelittlegirltips.org/uploads/1/3/0/9/130969674/130969674.html#virmire+mass+effect
    • http://cutepigproductions.net/uploads/1/3/0/5/130588627/291236.pdf
    • http://ermohitgodha.com/uploads/1/3/0/5/130588611/ecbb2.pdf
    • http://firstcarehomecarellc.com/uploads/1/3/1/3/131379035/7943179.pdf
    • http://mistysoto.com/uploads/1/3/1/4/131408616/7384705.pdf
    • http://mauiwritersretreat.com/uploads/1/3/0/7/130740242/mowexatuwev-poxavularesu-sodixuzi-gozofawixeve.pdf
    • http://nfpboardwisdom.com/uploads/1/3/0/6/130603913/nanopuburego.pdf
    • http://strawberrylovedesigns.com/uploads/1/3/1/4/131407361/telivitamaguxid.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_off000082d9.bin
c42ec2c004bd725a1a00c8fb2b386b87298b122a51afc37a33952fc42e8a2fce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D9 7340 bytes

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