Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8081f2fdd415c9d…

MALICIOUS

PDF

51.2 KB Created: 2020-08-23 17:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b2e28a44c8580afc93e25c98c53ead3 SHA-1: 355fe397d7c9dc68216b72062f3dc9f093d5a8a7 SHA-256: b8081f2fdd415c9d17c12e9a9093bb0dee27cecaab6386dc95e560abf259aec6
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and a benign-looking keyword, suggesting a lure. The presence of a link farm heuristic further indicates an attempt to distribute malicious content through a large number of PDFs. No scripts were extracted from this sample.

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=best+quality+king+size+sheets
    • http://files.dreampathwayskids.org/uploads/1/3/0/8/130814596/dabe9242.pdf
    • http://files.videoheads.co.uk/uploads/1/3/1/4/131408100/8c5dba02.pdf
    • http://files.thelittleschoolproject.com/uploads/1/3/0/7/130775098/lupadakumepemux.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/82340712586.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tapowizilefaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/91987366323.pdf
    • https://cdn.shopify.com/s/files/1/0445/6742/9279/files/38296772962.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/nutiwujida.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/sudogibogobixabopovokadi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/59797866209.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/72950186108.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/medical_microbiology_carter_center.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_off00008b46.bin
03d9e21937ea4605f7500e3d6e4adb769ec71fb896ac6c70532bcab1dafa2035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B46 5240 bytes
font_01_sfnt_off00009d28.bin
24150b5d827de12caba969a50bd2f314b5bf65d0b30f6d459c6baf19e577137b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D28 10380 bytes

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