Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8a5dc753bdbbad…

MALICIOUS

PDF

39.1 KB Created: 2020-08-24 17:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8447206f45f09e57af5cd3eeaf3ad01f SHA-1: f1acc5488b40b4434b5c2e096c1fbd7f1cf6a468 SHA-256: ab8a5dc753bdbbadbeb8e3e8cfc850d92d91bc942fb4572f524f7795d0110556
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=angle+relationships+worksheets+grade+8'. This URL is embedded within the document body, disguised as educational content. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely to improve search engine ranking for malicious content. The primary malicious IOC is the redirector URL, which likely leads to further malicious activity.

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=angle+relationships+worksheets+grade+8
    • http://files.ericrush.net/uploads/1/3/1/3/131398194/1341d63c49b454.pdf
    • http://files.neokundalini.org/uploads/1/3/1/4/131454586/numemelogabiwira.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/simple_llc_operating_agreement_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/oxford_discover_3_writing_and_spelling.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/2002867677.pdf
    • https://cdn.shopify.com/s/files/1/0436/9154/0634/files/9379798377.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/breadth_first_search_algorithm_with_example.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0436/8377/4614/files/ruxodinesenomatogiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/puvefigigiselafezuti.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0643/files/29341966785.pdf
    • https://cdn.shopify.com/s/files/1/0434/0704/8860/files/topew.pdf
    • https://cdn.shopify.com/s/files/1/0440/1171/6766/files/josada.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9953/files/industry_report_definition.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_off00005a11.bin
fb25d10f239f25b65312f323cdfbd6836625ff69184031a20a403eafee504693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A11 5560 bytes
font_01_sfnt_off00006d09.bin
5d22627b237679dfb43dcc28d19fd808497a6369689174675106faaffc7fdf4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D09 9872 bytes

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