Malicious PDF — malware analysis report

Static analysis result for SHA-256 28539b354afd4b6f…

MALICIOUS

PDF

38.1 KB Created: 2020-08-01 08:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8272638b17a215947f5dfdce53457dc4 SHA-1: 58c654b5055f74c1e2499a021945b6d1f71e255e SHA-256: 28539b354afd4b6fd6630abed560be86fa585d976d18dc4df726a6fb6cfa95aa
128 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, including one that redirects to malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=microsoft+document+imaging+to+pdf+converter, which is flagged as a malicious redirector. This suggests the document is designed to trick users into downloading malicious content by presenting a fake converter tool.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=microsoft+document+imaging+to+pdf+converter
    • http://files.njsaferatios.com/uploads/1/3/2/7/132712011/xigevewiti.pdf
    • http://files.williamstownjuniorsnetballclub.com.au/uploads/1/3/0/7/130775677/7073730.pdf
    • http://files.triswanpress.com/uploads/1/3/2/6/132681229/tufezukusigomogo.pdf
    • http://files.twigtravel.com/uploads/1/3/2/8/132814468/nuwino_pasosele_zusawitis.pdf
    • https://cdn.shopify.com/s/files/1/0436/0906/3582/files/jefip.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/50228284161.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/jedoma.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/xewalijifudofimonale.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6797/files/38967553776.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/20676579217.pdf
    • https://cdn.shopify.com/s/files/1/0437/7994/8705/files/wudimizagozo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/asm_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/3142/0319/files/busem.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/fewogamiguzuzep.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/radeduxilagewapenepuw.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_off00005713.bin
166a256263f38355b10eec7d551a144c7e7d82873d288fc6821da7f2b4ad82e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5713 5508 bytes
font_01_sfnt_off000069c9.bin
56813028bf8c8c7abda156b60c5c683e828351ba372cf7c98f15355f5dfdc365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C9 9844 bytes

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