Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc39334d6c5d35f4…

MALICIOUS

PDF

40.5 KB Created: 2020-08-02 09:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 062abf933cf251e9cf1fd14574999bc4 SHA-1: 5f80d858f6ef50682b19e4062d14583cb2a86f78 SHA-256: cc39334d6c5d35f457b71c59d6cdb64ffa4fb6dce25f3c2667e3b95691fc6ed3
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, a technique often used to obscure malicious intent or to engage in SEO poisoning. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely used to obfuscate the final destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact lure.

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/pify?keyword=object+object+on+form
    • http://files.alvarezorganic.com/uploads/1/3/0/8/130874146/2062587.pdf
    • http://files.biogeographyresearchlab.net/uploads/1/3/0/9/130970004/46645a06d3175.pdf
    • http://files.jcfarming.co.uk/uploads/1/3/1/8/131857421/7437542.pdf
    • http://files.vickialford.com/uploads/1/3/0/7/130776641/jiwanokegedo_befiwopawu_dezolenes_tokimaza.pdf
    • https://cdn.shopify.com/s/files/1/0430/3696/7063/files/peparede.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/vebamirenafuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7407/files/juzubaxasul.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5797/files/zaboxixaruriremonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/wakirupamubenevexisagima.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/rawuzuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/xozomevifezipez.pdf
    • https://cdn.shopify.com/s/files/1/0440/6483/3686/files/44739521125.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/rimuvolimafeke.pdf
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/85139944447.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/kujuwegevivitofudenozuga.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_off00006336.bin
bbaca04faf8e17d6de5d9e813c96f0d166640f936131ade152879dec2017e82a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 4852 bytes
font_01_sfnt_off000073aa.bin
563a30a2f358e34c2784ba9dc92ae6006ba925ea70b6903f4cb8c8e755ab2aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AA 9840 bytes

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