Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6b7b20fd5bc17e…

MALICIOUS

PDF

43.3 KB Created: 2020-08-15 12:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 557bb2f82c25dbf9ccc4c914e2cd1e86 SHA-1: d758b45a1eb18eeb53cdfb3a79f1903f685ebeb9 SHA-256: 3e6b7b20fd5bc17ef68be4fce4699b27b9c6cf36006c48b9f53cbdf714b11e0e
120 Risk Score

Malware Insights

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

The PDF file contains embedded links that are designed to redirect users to malicious websites. One such link, found in the document body and flagged by heuristics, is 'https://ttraff.ru/pify?keyword=simple+algebraic+equations+pdf'. This URL is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous links pointing to external PDFs, many hosted on Shopify. The primary intent appears to be directing users to malicious infrastructure under the guise of providing educational content.

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=simple+algebraic+equations+pdf
    • http://files.bapwmu.com/uploads/1/3/1/4/131483147/1515363.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://cdn.shopify.com/s/files/1/0449/5550/0712/files/double_entry_bookkeeping_class_11_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9584/files/fupetusek.pdf
    • https://cdn.shopify.com/s/files/1/0437/2470/1845/files/simbol_flowchart.pdf
    • https://cdn.shopify.com/s/files/1/0433/4216/8218/files/32153962025.pdf
    • https://cdn.shopify.com/s/files/1/0428/8479/2479/files/pagojuremalofatodexalusu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/99306441880.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/bijudaxasuwegelusat.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/zazalalup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/515018988.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_off000069cc.bin
a59ab0d66dbf68a4186b3e90cb371f7fcc21672fe3bd5492b20b8be96575f8e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CC 5844 bytes
font_01_sfnt_off00007d7c.bin
557535776c611cf7b5c3b1f51f2843177f92d3e67ed94bf36400fa781b468929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7C 10340 bytes

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