Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee82f5de10d9e9dc…

MALICIOUS

PDF

47.8 KB Created: 2020-07-30 19:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b260f3784ab9749c7f423c98194aff69 SHA-1: 22c6ac520f13211d955f1684f9f7e872cc2b76eb SHA-256: ee82f5de10d9e9dc5e95399f213121a2a6eb21a491befbfbcc4b509064b1d834
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to use link farms for malicious purposes. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to 'worksheets'.

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=camouflage+and+mimicry+worksheets+pdf
    • http://files.amberwhitted.com/uploads/1/3/0/9/130969075/67d9e7.pdf
    • http://files.dreamingbigpublications.com/uploads/1/3/1/3/131379540/a8833219000e.pdf
    • http://files.drtaotcm.com/uploads/1/3/0/9/130969057/gajegawumiwiwu.pdf
    • http://files.ballinloughgfc.ie/uploads/1/3/0/8/130874667/komatunemeju.pdf
    • http://files.ballin
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/18156852108.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/12987185627.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/xulakanilaladusu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/nojoserir.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/sipuwumidalutirimuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6101/files/71993527385.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kozaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/11757677123.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/kunaxuvolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/xokazawaloravexupikorez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ab.bin
91cb2e9a57222389b042784ad67ef981e1021442ee53a7d029a3591bf8c0336a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AB 5732 bytes
font_01_sfnt_off00007a29.bin
b4fe916807fc386a3015fb894775ba4555d8b7a64116578f057b276b72eece8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A29 10256 bytes
font_02_sfnt_off00009d1e.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1E 16092 bytes

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