Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea51aa577d8cc3ed…

MALICIOUS

PDF

52.9 KB Created: 2020-08-09 05:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0a954315dadcfb46fe5350450a99d73 SHA-1: 5e943ca3e878c2f3499310753bbb3745166f6ada SHA-256: ea51aa577d8cc3ed8e85bac6d932e32138760c050e0d7d63c51e3aa9afcdffc7
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=handyman+services+list+pdf'. Additionally, the document exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are to Shopify domains hosting other PDFs. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=handyman+services+list+pdf
    • http://files.jlsvalves.com/uploads/1/3/1/6/131636914/kibixube.pdf
    • http://files.christianlitforafrica.org/uploads/1/3/1/3/131380177/d3daf23.pdf
    • http://files.djcattrellauthor.com/uploads/1/3/1/8/131856770/e4b1b84b.pdf
    • http://files.judithasem.com/uploads/1/3/1/4/131437513/4d7bf7c7c0f1.pdf
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/numbers_1_1000.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/70069254957.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/63690721805.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/7308197269.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/73033819166.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/16536725220.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/22602138586.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/jinofufanokisutovixejizuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9032/1313/files/12983957418.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/somebody_save_me_smallville.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/oriflame_catalogue_november_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/6615/4394/files/87983987651.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_off00008ff6.bin
27cc5cfe9caa2e12231bcae7a2bcc18153d447d3caaee324559552596369ec1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF6 5424 bytes
font_01_sfnt_off0000a262.bin
762f2ad139531136372c132c0aec88e58018333b53124c89c341f1c8e2d4a9d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA262 10652 bytes

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