Malicious PDF — malware analysis report

Static analysis result for SHA-256 c930176fe350db03…

MALICIOUS

PDF

39.6 KB Created: 2020-08-18 15:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ef45f0b180f253c381a7adc996407ca SHA-1: ea67fa0860a134b834f00351a0fac3baa2c492b5 SHA-256: c930176fe350db0330224cf069cef6350abb5db1c29020e96f910e0e97d8ebbb
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a redirector at ttraff.ru. This behavior is indicative of a link farm or redirection scheme designed to obscure the ultimate destination and potentially lead users to malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the ttraff.ru URL as malicious. The document body itself is heavily obfuscated and contains the malicious URL, suggesting an attempt to disguise the malicious intent.

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=abrsm+syllabus+overlap+information
    • http://files.airedales4u.com/uploads/1/3/0/7/130776611/8140345.pdf
    • http://files.texascenterforregionalstudies.net/uploads/1/3/1/8/131856381/29afc.pdf
    • http://files.nchomeremodel.com/uploads/1/3/0/8/130874042/togijigeboxupev_sobuzo_tirinebeja_mazawe.pdf
    • http://lojozozeg.oldetownemusic.com/uploads/1/3/0/7/130738524/1880078.pdf
    • https://cdn.shopify.com/s/files/1/0439/4693/4430/files/tudipekirapeburetisufoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4885/files/tivababumubem.pdf
    • https://cdn.shopify.com/s/files/1/0449/8640/0936/files/the_opportunity_analysis_canvas_for_student_entrepreneurs.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6042/files/tofunutexifaziteja.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/zuboropupudesalopobuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/23261918360.pdf
    • https://cdn.shopify.com/s/files/1/0438/0937/4365/files/wikixukero.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/google_fi_codes.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/voketo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8519/files/54959725804.pdf
    • https://cdn.shopify.com/s/files/1/0434/7350/2361/files/nyc-_210_form_2015.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_off00005e01.bin
d1dc48eb734143e88490688260b9c19b09fd9df3a4a574afe6558099ecc36d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E01 5340 bytes
font_01_sfnt_off00007018.bin
310e0e0ad848e2736a2fa14d5add916e7e9490d028f61c404f6a985f0c39da78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7018 9876 bytes

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