Malicious PDF — malware analysis report

Static analysis result for SHA-256 2520eb136fb9e43f…

MALICIOUS

PDF

49.8 KB Created: 2020-09-12 12:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c0249fb187f2e37df788fe681d3093e SHA-1: 922751aa3480e9d1d164127a7e3d58ad4927432b SHA-256: 2520eb136fb9e43f12288e08ffb2bce18ef91176b6b27d2f6aebe6252250c5a7
150 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external links, including one pointing to a known malicious redirector. The primary malicious URL identified is https://ttraff.link/wix?keyword=vba+recordset+data+format. The document body, though heavily obfuscated, contains references to URLs and appears to be generated by wkhtmltopdf, suggesting a potential attempt to disguise malicious content within a seemingly legitimate document structure. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=vba+recordset+data+format
    • http://lexumuw.famuwesley.com/uploads/1/3/1/6/131606365/zumak.pdf
    • http://files.laughingdogsacademy.com/uploads/1/3/1/3/131398360/744332494b0f84.pdf
    • http://sinuzeb.myattsfieldspark.info/uploads/1/3/1/6/131606289/7136794.pdf
    • https://static.usrfiles.com/ugd/61804c_1b228cadcbad4a2bae32a2dd973d60bb.pdf
    • https://static.usrfiles.com/ugd/bf650e_f83c52c5263d46c19c707505f611eba5.pdf
    • https://static.usrfiles.com/ugd/a298ce_f86a7d5f08f5433f91046a725eae4e3c.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/76589020565.pdf
    • https://cdn.shopify.com/s/files/1/0437/0225/5770/files/fidolila.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/vapaxisuwof.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9661/files/vlookup_function_in_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://static.usrfiles.com/ugd/a9248e_afb33d5cd1164abf9f9b2bc44f7b6ee3.pdf
    • https://static.usrfiles.com/ugd/361045_34ea4b0997604c6d9b7fb056549a3356.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_off0000843e.bin
13e43b41f8c60aa379ceadf102eb5f84bb595081effa7ad27952189354c03e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843E 5240 bytes
font_01_sfnt_off000095fc.bin
1270d8328bae2561af9eb389758f7a8bffcbf72868dde3d9cfe9988be69f221c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95FC 10724 bytes

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