Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a19ad61dad6e94…

MALICIOUS

PDF

45.1 KB Created: 2020-08-26 08:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a20cafa35b3821aeb1e273db699a6001 SHA-1: b31e7d7214b5821f3e402dc1e4ae6d50cd36a410 SHA-256: 98a19ad61dad6e94e41e604437bfb1710da27da92f9353efb16a554f33414d74
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to leverage search engine optimization for distributing malicious content. The primary malicious URL identified is https://ttraff.cc/pify?keyword=exercicis+separar+s%25C3%25ADl%25C2%25B7labes+primaria, which likely serves as a gateway to further malicious sites. No scripts were extracted, but the structure of the PDF itself is indicative of a link-farming and redirection attack.

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.cc/pify?keyword=exercicis+separar+s%25C3%25ADl%25C2%25B7labes+primaria
    • http://wetovorit.elliseffect.com/uploads/1/3/0/7/130775209/3069555.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/34664891393.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/72353618990.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/85517306069.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/synopsis_of_banking_management_system_project.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/razulexumizajex.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/wenasejoleben.pdf
    • https://cdn.shopify.com/s/files/1/0435/7714/7547/files/tupugaxolisigulomevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3816/files/domasunomasu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/xexetigasuvobizina.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_off000064b6.bin
029b19289cea7854a2bb7aef16ae0f0570467b54dc2fcd8007505de597f72dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B6 5332 bytes
font_01_sfnt_off000076c6.bin
ec50cc2b4a126f34dc158554716b79972873b1a10dc8213c937a30f5e2e9f44b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C6 15452 bytes

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