Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ca127a48950262…

MALICIOUS

PDF

39.6 KB Created: 2020-08-06 11:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cb62c100cde7ef3aed731e84c3cda24 SHA-1: e305b95af04752bd967d370810b8363adfdd812c SHA-256: a9ca127a489502621da68374b30435db5055868a86d2fb255bb384e87136b13f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=castle+risk+rules+pdf'. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to benign Shopify URLs but likely serving as a distraction. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.ru/pify?keyword=castle+risk+rules+pdf
    • http://files.almeria-estates-and-realty.com/uploads/1/3/1/4/131437351/fefozo.pdf
    • http://givodu.farmtoartfun.com/uploads/1/3/0/8/130813108/metuwewo.pdf
    • http://files.pink-backpack.com/uploads/1/3/1/4/131453114/borulazara.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/honeywell_thermostat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/7576927167.pdf
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/75757728009.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/dojulidiwuxunajopabobajex.pdf
    • https://cdn.shopify.com/s/files/1/0432/7437/1235/files/92652049141.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/xopezunikifogotutujuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/nuwexotaronisebilefoven.pdf
    • https://cdn.shopify.com/s/files/1/0439/1917/9931/files/17178364357.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/jedenepumigijezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/43704704247.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_off00005e93.bin
8880e1cda24a20358de7d2069d202cf31dd8abff5cdf391e9da1d3e3927b9c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E93 5004 bytes
font_01_sfnt_off00006fa3.bin
d9471f44160a70e02f049968881cc29dbe69815d260296e6ec092ce8aa09f961		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA3 10104 bytes

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