Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cd8793acae208b…

MALICIOUS

PDF

35.9 KB Created: 2020-08-13 11:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b059f81daf2928235c156b38ed0bfe3 SHA-1: f51fcf0b530c7207e2950a118b1803f9cf1ec710 SHA-256: f6cd8793acae208b73168c60e958d8a764acede98afb98eb968aa7256de8aea2
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are SEO-optimized and point to benign Shopify domains, but one critical link redirects to the known malicious domain ttraff.ru. This suggests a link farm or SEO poisoning technique to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.ru/wb?keyword=rational%20exponents%20grade%2011%20pdf
    • http://files.birthcaremidwives.com/uploads/1/3/1/0/131070597/vekukij_fupatadeka.pdf
    • http://jorakuje.mellowinthemeadow.co.uk/uploads/1/3/0/8/130874457/fipuluvugevabo-samitir-pogemot-nozubud.pdf
    • http://files.rayofaura.com/uploads/1/3/1/8/131856446/fejukanefo_kesotokefet.pdf
    • http://balidi.windowsofhopeintl.org/uploads/1/3/2/7/132710712/ruginedolisuzeforu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2309/8279/files/introduction_to_manufacturing_processes_groover.pdf
    • https://cdn.shopify.com/s/files/1/0448/1508/9825/files/70571055372.pdf
    • https://cdn.shopify.com/s/files/1/0439/6823/3630/files/welokefefuzanumusejujada.pdf
    • https://cdn.shopify.com/s/files/1/0434/2454/6972/files/65521307215.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/dudirabulid.pdf
    • https://cdn.shopify.com/s/files/1/0438/2100/7005/files/png_interlaced_what_does_that_mean.pdf
    • https://cdn.shopify.com/s/files/1/0434/4437/1613/files/19461873180.pdf
    • https://cdn.shopify.com/s/files/1/0435/0689/2960/files/wakotixino.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/65594708452.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/kugefikidakatojaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/5742617786.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4340/files/30978160388.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/ruwaxosekoda.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_off00004da6.bin
b0539e0f0978c452505e36678200c709eb808c2a5242eb189c54f46ca824ea2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA6 5336 bytes
font_01_sfnt_off00005fed.bin
9865549ebc07983489e53e8a52f24f84848ae9715e0550b50dbbfcf2564a91f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FED 10688 bytes

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