Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8e5a8ca11c1d47…

MALICIOUS

PDF

45.2 KB Created: 2020-08-30 07:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1c94d1950f98e069be53ea10b7864f9 SHA-1: fb8d5669345a9788fba08c317044b40e43f8a42c SHA-256: 3f8e5a8ca11c1d47854788c31ed46b1829b6cf19eca619bb570b440ace14aab0
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=new+homemade+porn', which is associated with malicious redirector infrastructure. The presence of numerous external PDF links further suggests a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=new+homemade+porn
    • https://static.usrfiles.com/ugd/2f07a1_6ad18a11a4144306b8a64806afcd3d50.pdf
    • https://static.usrfiles.com/ugd/ee6770_be83bef0c54a484ea8e1e94290021450.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8e8454c5ca4b17a035b86919f28ad0.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/wetelit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/24603161235.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89573664631.pdf
    • https://cdn.shopify.com/s/files/1/0434/7677/9174/files/gleanings_baha_u_llah.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/leripegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/8921824882.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3447/files/poragusujakovaguwepak.pdf
    • https://cdn.shopify.com/s/files/1/0434/9191/7989/files/25560610668.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/15202420918.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_off0000722f.bin
a3c1bf466323a21e91bda00c6f664d833ef5e0348324b2981335b6e0f9eaad31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722F 5048 bytes
font_01_sfnt_off00008348.bin
e42ee97aef2cdeccbfca6f4f2f97dd8ec68d6b019e944c40223510e096ebca9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8348 10744 bytes

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