Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3a0754c5eec13e…

MALICIOUS

PDF

40.8 KB Created: 2020-05-22 09:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5fd0a0c9ae5a71cc2ba6db1c40e45d5 SHA-1: b6b8c39194e1aa3a3bf3ea869d34474d1fcf6e5a SHA-256: 8b3a0754c5eec13e191d82e6cf6898226970a5dceb10954ac7471cc5e776baf1
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, many of which are SEO-optimized and lead to other PDF files. This technique is commonly used to distribute malware or phish for credentials. The presence of the 'PDF_SEO_LINK_FARM' heuristic firing strongly indicates this malicious intent. The document body contains a lure related to song downloads, likely to disguise the malicious nature of the links.

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://1a.undesirable.us/uploads/1/3/0/4/130476317/130476317.html#manikya+malaraya+poovi+song+download
    • http://lincolngroom.com/uploads/1/3/0/4/130483343/jomizivili.pdf
    • http://30-32royalstreet.com/uploads/1/3/0/4/130483514/1439162.pdf
    • http://technicalserviceprovidersnetwork.com/uploads/1/3/1/0/131070393/falose.pdf
    • http://kaufmanfinsvcs.com/uploads/1/3/0/7/130739474/pigikatovasekelum.pdf
    • http://visionpropane.com/uploads/1/3/0/2/130272585/gufukisoxedupofepin.pdf
    • http://autodiscover.binz-38.ch/uploads/1/3/0/6/130639215/sojokepufatuwuso.pdf
    • http://capacityworks2.com/uploads/1/3/0/6/130620890/adac216ea2.pdf
    • http://stlplaytherapyinstitute.com/uploads/1/3/0/5/130589322/1333489.pdf
    • http://quotefromwes.com/uploads/1/3/1/4/131453577/sudamovemuxibul.pdf
    • http://quotidianqueen.com/uploads/1/3/0/6/130621781/30929f7adaafe6a.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_off0000619d.bin
e208c452f440587977bb2f0ca5431322b1d8f16d2722f120ea25c971492a5a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 4156 bytes
font_01_sfnt_off00007194.bin
95cbb7cc9bbb7a92383fefe471f2054c67fb7998aed77d7ec7ecaf7d07f29f93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7194 11488 bytes

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