Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93542507eb97bf5…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 17:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d19fa89098f0b7bab58cdf12845ca53 SHA-1: a4ad90db65755363fd84297ab2e63f3a05e7d229 SHA-256: a93542507eb97bf5fa8c2463616d3375953dbdad93c7e40c24334e8faedfb90c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com' with a query parameter suggesting a lure for installing Windows Photo Viewer. The document body, though heavily obfuscated, contains a similar URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely to manipulate search engine results or distribute further malicious content. 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.com/wix?keyword=install+windows+photo+viewer+windows
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/55828470344.pdf
    • https://cdn.shopify.com/s/files/1/0462/1765/8521/files/fanesovogu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2488/2583/files/97th_amendment_act_2020.pdf
    • https://static.usrfiles.com/ugd/b8c837_d967a99cd044451d89a542901f258b04.pdf
    • https://static.usrfiles.com/ugd/b8c837_202fe91f9142425b820dfc3f5eef2343.pdf
    • https://static.usrfiles.com/ugd/b8c837_d09a7755d81c41c5be4fe9e2f898cce6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdfa90182a5d4bc28e25f13ed5d7ec77.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/vaxopisimuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/11502670180.pdf
    • https://cdn.shopify.com/s/files/1/0463/5695/5302/files/mezokirorebajavemuxedod.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/lesofewimamejozux.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_off00005bf8.bin
da4f3883c4bcb991ddc649145a086954612e03a94b925ce0995d6a87d3c4c8ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF8 5136 bytes
font_01_sfnt_off00006d78.bin
a53cdaeecf68b87ba0ba8ae9feebfd475748fda86c5581c6f78269fd62d5245b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D78 10316 bytes

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