Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d6e06261bbddc3…

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 22:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1399aa463088476c9d9cf36592d238e SHA-1: 72f794ad5fd4b8d919ca870fac9d4d2b570c2d3e SHA-256: c6d6e06261bbddc3b704f5fe7d7f71cd80ad60f5d92b876bc4fa4c351c4352f1
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=cpctc+guided+notes'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous links, many of which point to benign Shopify-hosted documents. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text fragments related to 'cpctc guided notes' and the authoring application, suggesting a lure.

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.cc/wix?keyword=cpctc+guided+notes
    • https://cdn.shopify.com/s/files/1/0459/8982/2631/files/hormel_foods_corporation_annual_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0461/8292/4441/files/getting_blood_on_hotel_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/89837124765.pdf
    • https://cdn.shopify.com/s/files/1/0436/2010/6404/files/read_a_file_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0439/5896/0286/files/13894759479.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/89863768185.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/20824618214.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/wedding_newspaper_template_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/ledot.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f165b50ab104c9c8197b1a3a659bd3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c97a82544fe94d92bc39cdba9a0d821c.pdf
    • https://static.usrfiles.com/ugd/b8c837_97ced84cf33f4380a7f992ef97d4d2bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_685805a2e6f94bc3a55f425cf588e642.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd83b711650c46d0ace2eb252c52e830.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/63363933386.pdf
    • https://cdn.shopify.com/s/files/1/0431/2445/7633/files/website_article_format_apa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/2020_buick_lacrosse_owner_s_manual.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_off0000666b.bin
3197ee2400934cc74ba97bc9ef1455083da9ff59673a1d87ba38cb678d6b8130
pdf-font-stream PDF embedded font (sfnt) at offset 0x666B 4808 bytes
font_01_sfnt_off000076d4.bin
d71ea62e317b3c9dc5ed9d094e86460a14a953e23d08e431b893e44e68f93124
pdf-font-stream PDF embedded font (sfnt) at offset 0x76D4 15096 bytes