Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe79c75fb227b57…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 22:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb9d70a6f959bb0411788763472b150 SHA-1: 63a59a8c1d5801f1d078fde1bd9c8ff790aff1d2 SHA-256: 3fe79c75fb227b57c5f1b6cac21b71c600829fb172832fe72c0fe82e0ac140a2
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous external links. One prominent link, 'https://ttraff.com/wix?keyword=fractions+in+order', is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of these links suggests an attempt to lure users to malicious sites or manipulate search engine rankings.

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.com/wix?keyword=fractions+in+order
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/bunowejiza.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/kazoxarukodisarobiwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/wefafalarusu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/food_web_diagram_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/kptcl_exam_question_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9586/files/writing_expressions_and_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6949/files/kejinelarobefobodibox.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/todomutogubawajejafolexu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2240/files/3154543050.pdf
    • https://cdn.shopify.com/s/files/1/0446/6409/4873/files/jiruvo.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7249/files/21333485720.pdf
    • https://static.usrfiles.com/ugd/b8c837_7366e8f288254cdc89682d91f35a805a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9522a37077854400a4d90deb1b986093.pdf
    • https://static.usrfiles.com/ugd/b8c837_9878380b4589458a9e397987f4a737ac.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_off00005fb8.bin
cb4df0afbe20012aba1c064f9c6d1ea28022f9bfc775520cfb929cd389eb3298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB8 4856 bytes
font_01_sfnt_off0000703c.bin
3a703991561d408b6ef0489a0f5286e98b3d6931ffda54908b61051430a9cc36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703C 9804 bytes

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