Malicious PDF — malware analysis report

Static analysis result for SHA-256 deffdd4d1ec1cb1c…

MALICIOUS

PDF

39.7 KB Created: 2020-08-13 11:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b872adecc3475e4e6ba94890cf2eb214 SHA-1: 3d9463aab882451339bbb8ba5f6d67233baa9fe6 SHA-256: deffdd4d1ec1cb1cfe80c797d8f3789d05b65dba7862e92a3e5b57a201c343d7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text referencing a 'Craftsman 150 psi air compressor owners manual' and the malicious URL, suggesting a lure. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, but one critical link to a redirector. The ML classifier also strongly flagged this PDF as malicious.

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=craftsman%20150%20psi%20air%20compressor%20owners%20manual
    • http://files.holdingspacedoula.com/uploads/1/3/0/8/130814611/15639a10ed6.pdf
    • http://lojaje.tabasandrosen.com/uploads/1/3/1/8/131856318/960929.pdf
    • http://files.thestaratstar.com/uploads/1/3/1/6/131606003/jolanunewup.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/8805692261.pdf
    • https://cdn.shopify.com/s/files/1/0439/2671/6584/files/limem.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/kenmore_elite_oasis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/37786190333.pdf
    • https://cdn.shopify.com/s/files/1/0430/6848/9881/files/18014187359.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/11036360218.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/buvemotorijanebotoxurabax.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3344/files/57542339935.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/gojir.pdf
    • https://cdn.shopify.com/s/files/1/0430/4188/2265/files/89760650116.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/4747951367.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/pegekarezanaru.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_off00005ca5.bin
cb8c8025155942279b709d745ad65fb43ca0beb6dd13c4d6c6c9c442a00c427d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA5 5476 bytes
font_01_sfnt_off00006f3c.bin
9a6d09323fa5a3b35d6f446980465bfca6c47d4603f5d97f10ac9807e3ef9461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3C 10060 bytes

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