Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cc7214cad90eec…

MALICIOUS

PDF

45.3 KB Created: 2020-08-06 14:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1b20735ea61a6b29d522f627ca2bc25 SHA-1: 80e33707b7ca8630f3117ffb1f0587605707da54 SHA-256: 82cc7214cad90eecfba50dd91db5f34338cfcca0be777ebf06d73395b492ce0e
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as curriculum documents, but the primary link redirects to a known malicious domain. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and several benign-looking Shopify URLs, likely part of the link farm. The attack pattern is a lure to a malicious redirector.

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=lower+primary+level+curriculum+designs+volume+one+pdf
    • http://files.dallasavenuedental.com/uploads/1/3/0/7/130739204/233667.pdf
    • http://files.wilsonshandymanservices.com/uploads/1/3/1/0/131070186/wetarelileves.pdf
    • http://files.kidkatranch.com/uploads/1/3/0/7/130775627/rutupafukoxena.pdf
    • http://files.sarahschuessler.com/uploads/1/3/1/4/131407802/9836607.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/gowurepumofuxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/faledowomoribifujipan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/womutinuzuvaliko.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/25114451610.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/kafamosixugoxadije.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/76917512562.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/49936654231.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/dubuvupudirafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3727/7855/files/42830267142.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.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_off00006ae3.bin
b6e687d528097c71ba226124845a0275cb73fa21ad0a5841aff71381f6ea3890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE3 5668 bytes
font_01_sfnt_off00007e3a.bin
b226f053b1cf4ac8010d49b5c9c0988639f02463a92a2330b86957028fe7ed3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3A 13424 bytes

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