Malicious PDF — malware analysis report

Static analysis result for SHA-256 937ba289f0a87f6d…

MALICIOUS

PDF

46.8 KB Created: 2020-08-12 20:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67423cd103eca3c6b53cd83dbdd0c694 SHA-1: 0955674b1e2e5338c5da87c252eca8546bac7d48 SHA-256: 937ba289f0a87f6da4742d74f571192e3810dd523ed83e462d3143b1adbcd77e
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=binomial+expansion+theorem+pdf', suggesting a lure to disguise malicious activity. The presence of numerous links to Shopify-hosted PDFs indicates a link farm strategy to improve search engine ranking for malicious 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=binomial+expansion+theorem+pdf
    • http://files.meadowlynnfarms.com/uploads/1/3/1/3/131379268/9171176.pdf
    • http://ronexas.verisoftgroup.com/uploads/1/3/1/3/131383377/naxekaro-gowotoninisuku-xudisuwig-sarejusawi.pdf
    • http://files.valleyfieldfarmltd.com/uploads/1/3/0/8/130813906/4534449.pdf
    • http://files.omraneguedhami.com/uploads/1/3/0/8/130814126/kogikilunem.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/58844009162.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/new_headway_beginner_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/20450856753.pdf
    • https://cdn.shopify.com/s/files/1/0437/4796/7130/files/consonant_blends_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/6408/1046/files/nofiribuka.pdf
    • https://cdn.shopify.com/s/files/1/0440/8374/0822/files/biwejutimegiwevabaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/88723150310.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/structuralism_and_functionalism_in_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/tunane.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/liregufunag.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_off00006e73.bin
07c6d6360fd91a318e61b32e8a5fc4dec0739b8f26988073016a7efc34e7940e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E73 5400 bytes
font_01_sfnt_off00008096.bin
25695f1674cfaa1fa4bd4640fc7f144e16c531d5f892b1ef5adf22cf248f03b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8096 14424 bytes

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