Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cbdd8537245161…

MALICIOUS

PDF

52.2 KB Created: 2020-08-22 06:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8959c23ce18b3461cb713d106eb96dc1 SHA-1: 49450b708c15df5dc6e24a9147d6a588d6bfbdce SHA-256: 37cbdd8537245161496614d7f5a9904e60305d5289df153f9616827bd9e047a5
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of these links, https://ttraff.com/pify?keyword=taxonomy+of+learning+objectives+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting the primary purpose is to lure users to malicious sites through a link farm.

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/pify?keyword=taxonomy+of+learning+objectives+pdf
    • http://files.aaronjnorris.com/uploads/1/3/1/6/131607010/441d09a06171.pdf
    • https://cdn.shopify.com/s/files/1/0434/5482/4598/files/9897661941.pdf
    • https://cdn.shopify.com/s/files/1/0434/4833/6536/files/algebra_1_chapter_2_practice_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/7450/9213/files/aws_console_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3931/files/statistical_significance_test.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/89033407878.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/savenova.pdf
    • https://cdn.shopify.com/s/files/1/0436/9580/0475/files/learn2serve_alcohol_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/gawugapalijibonozexogaref.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/wewurenedijuxumukariluf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/36930474723.pdf
    • https://cdn.shopify.com/s/files/1/0448/7554/6791/files/physical_and_cognitive_development_in_middle_adulthood.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_off00008373.bin
2abe5870afadb07513d131c1ad9998e95dcf7f5265488f09d7b624b4e12de6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8373 5868 bytes
font_01_sfnt_off0000976b.bin
c6ac13b7e1e71d0cf2b0d52b4c35712357d7f029c4d8364071612404041ec383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x976B 14300 bytes

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