Malicious PDF — malware analysis report

Static analysis result for SHA-256 a916716dd7d31a75…

MALICIOUS

PDF

37.3 KB Created: 2020-06-16 04:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baa75b40bd06c273cd6749b88df94454 SHA-1: 9ceb9214376dd86d6544ecef48ba119d6009faf7 SHA-256: a916716dd7d31a75073b3fb85128247a4d8815be81a275ed9d2dbeec76e4a4cd
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains references to a 'smoked palette tutorial' and includes numerous URLs. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to distribute content or redirect users. The primary attack pattern involves luring users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mg3.brdge.org/uploads/1/3/2/6/132682813/132682813.html#smoked+palette+tutorial
    • http://crossfamilystudio.com/uploads/1/3/0/2/130272389/kegosijufuvuleledel.pdf
    • http://lagoblutravel.voyagerwebsites.com/uploads/1/3/1/3/131380604/0321fbe874c06.pdf
    • http://ayeyarwaddyinternationalschool.com/uploads/1/3/0/7/130775001/2914852.pdf
    • http://newbraunfelsconcreteconstruction.com/uploads/1/3/0/6/130620327/nutebuwuwavawe.pdf
    • http://ipv6.michelepowles.com/uploads/1/3/0/6/130622025/a6166affc3.pdf
    • http://cpanel.ashleymartinportfolio.com/uploads/1/3/0/6/130621720/vizakitukanolo.pdf
    • http://paintingholidays-france.com/uploads/1/3/0/8/130874246/8115977.pdf
    • http://mail.fatherjim.com/uploads/1/3/0/8/130874629/50f821448a331c.pdf
    • http://jewliesjewels.com/uploads/1/3/0/5/130590482/kutibuvezebudobuwela.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_off00006448.bin
9ea847cc395eca5a60af7adeb93e375cfbaec6bdba2741f098e204f1afe4d0d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6448 10812 bytes

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