Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a39ffc8d6631fc…

MALICIOUS

PDF

41.7 KB Created: 2020-08-11 23:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b97811af3972a2f1d61f7916a749cb5 SHA-1: 44d2d4f850ea16ca94bd64dc2c331cc7f1c4d8ce SHA-256: 90a39ffc8d6631fc42ca310f1fdc119566feef7d0cb2593d0a0a469a9aa5a4c2
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a link farm or SEO poisoning attack designed to lure users to malicious content. The document body, though heavily obfuscated, contains the same malicious URL. The primary attack pattern involves a deceptive lure to click a malicious 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.cc/pify?keyword=calendar+related+aptitude+questions+pdf
    • http://files.thevillageyarnery.com/uploads/1/3/2/7/132740805/2017469.pdf
    • http://files.mifflinfootballgolftournament.com/uploads/1/3/1/4/131482958/9041386.pdf
    • http://files.fbcsnyder.com/uploads/1/3/1/4/131406780/27c5c31b8f85.pdf
    • http://nulib.markers4health.com/uploads/1/3/1/3/131383965/7885900.pdf
    • http://files.yippeewebdesign.com/uploads/1/3/2/7/132740533/8726418.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/kubuno.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/kefutarukepew.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/batowemafotuxuxan.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/7397121198.pdf
    • https://cdn.shopify.com/s/files/1/0432/5113/8715/files/99084256487.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/91680682253.pdf
    • https://cdn.shopify.com/s/files/1/0433/5989/5717/files/biraj.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/nemexe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/49119374776.pdf
    • https://cdn.shopify.com/s/files/1/0438/0511/4528/files/nirvana_buddhism.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/peguzegi.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_off00006700.bin
bc4d785bf5450eb528e4a25898ac60ebda430799182460925af156bdb112628b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6700 5064 bytes
font_01_sfnt_off0000783d.bin
d5364fdabedfeb7ed464ee1d678f4c93dbda810839199d14f1fb0380574fd136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783D 9872 bytes

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