Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8c83f0e6e5c6e0…

MALICIOUS

PDF

46.2 KB Created: 2020-08-23 07:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98a975b57f50087097fc5ecf9fd78269 SHA-1: 16cbe41d2a1e30bb4b86ca7d08d3212e845af784 SHA-256: 4b8c83f0e6e5c6e042bf13090fe265d4730c1ff43b2ddfa0dc7f3486508862aa
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=hello+brother+songs++tamil'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are to Shopify domains hosting PDF files. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document.

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/pify?keyword=hello+brother+songs++tamil
    • http://sizipozex.designspace-interiors.com/uploads/1/3/0/7/130775932/buriwusimowotuxire.pdf
    • http://files.profrichmuller.com/uploads/1/3/0/8/130874652/lojuvibul-neludodofevo-nozojikeser-vimugapivemagaj.pdf
    • http://files.serenitywholisticliving.com/uploads/1/3/2/8/132814219/lamidavobu.pdf
    • http://files.ducksnestdecoys.com/uploads/1/3/1/3/131378975/kosuludovom_suzepi_tenevasa_kulezadugujiwe.pdf
    • http://files.theworcshop.com/uploads/1/3/0/8/130814106/nikatajaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1432/3356/files/pafote.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/zepalapuzaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/circulatory_system_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/76953045688.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0392/files/5189300961.pdf
    • https://cdn.shopify.com/s/files/1/0448/6434/0130/files/animals_reading_esl_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0445/8423/9268/files/choose_the_correct_answer_in_french_language.pdf
    • https://cdn.shopify.com/s/files/1/0434/1976/2855/files/zaperoneneru.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_off000066b7.bin
a5909b34c6c5ef8c73c1ccab1296d44bb8147e31a1550913cd2a67b4a016aa47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B7 5200 bytes
font_01_sfnt_off00007837.bin
1fb14eb71cd62c7629f462978794bcabf107bf295e4f6bbd404a258f82424b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7837 16072 bytes

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