Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d3ebbd4e8bdf5b…

MALICIOUS

PDF

51.6 KB Created: 2020-08-04 02:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6c5173de124b287f7c9862007d44aa8 SHA-1: dfbe005e3ddd4efe243e5ce445e67ec70d7ef09e SHA-256: 42d3ebbd4e8bdf5b33aa68ccce69c210feea5b8f282a5bb087078abd662820b0
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO manipulation scheme. The primary malicious URL identified is https://ttraff.ru/pify?keyword=ipcc+cost+accounting+formulas+pdf. While no scripts were extracted, the sheer volume of outbound links and the ML classifier's high confidence indicate malicious intent, likely to direct users to potentially harmful sites.

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=ipcc+cost+accounting+formulas+pdf
    • http://files.robertkaltenbach.com/uploads/1/3/1/4/131409755/notafep.pdf
    • http://files.cesun2018.org/uploads/1/3/2/3/132303229/xepolege-resevuxokabodil-bigake.pdf
    • http://files.nicolebando.com/uploads/1/3/0/9/130969438/kosirasi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/18132658635.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/limojegikoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/54650052365.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/95897016044.pdf
    • https://cdn.shopify.com/s/files/1/0438/5079/3110/files/54517546291.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/wukog.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/suvolalusuri.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/56795351462.pdf
    • https://cdn.shopify.com/s/files/1/0439/5103/0430/files/guniv.pdf
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/72428423632.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7162/files/nln_exam_study_guide.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_off00008b2f.bin
0cf3d0e7277ff7ecadf5c75b6b41415d77d35c6a066fa2efa189a0e4cc8b7ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2F 5412 bytes
font_01_sfnt_off00009d86.bin
941f3db85973c025aeb2fa45b720887bb1ef0dc58b8129637c5f5b5d114d497d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D86 10540 bytes

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