Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c5646f08c67cda…

MALICIOUS

PDF

60.4 KB Created: 2020-09-01 12:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d51fa5399c43e6bfe88f5a6a49c24ee SHA-1: ca32bb9d35ccbc0726d2936b3a1d99fb583bedf4 SHA-256: b6c5646f08c67cda8d25afb1d7d904959b27448b9da635e40286b87c0eacf0c9
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=shaun+the+sheep+cartoon++free'. This suggests a phishing or scam attempt, using a search query as a lure. The document body, though heavily obfuscated, contains the same URL, reinforcing its role in the attack. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to obscure the malicious redirector.

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/wix?keyword=shaun+the+sheep+cartoon++free
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/zaxexewisifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/resukuwovubuj.pdf
    • https://cdn.shopify.com/s/files/1/0439/2845/3288/files/authorization_letter_to_collect_cheque.pdf
    • https://static.usrfiles.com/ugd/b916f4_ce6dd947cf914caea3b737f9bc8d7a75.pdf
    • https://static.usrfiles.com/ugd/cc03df_7693458459c446edb815633a6281b9a3.pdf
    • https://static.usrfiles.com/ugd/4b874d_c879647ea2d54cce8a9e3d333e6e9b0d.pdf
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/79581905798.pdf
    • https://cdn.shopify.com/s/files/1/0436/1725/5581/files/zisuxuxigazuwevu.pdf
    • https://cdn.shopify.com/s/files/1/0450/6048/9379/files/75849173142.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/progression_accords_guitare_jazz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0997/files/xuvulijigusurapoxuxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/4646/1855/files/95503712082.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_off0000b119.bin
25893df83bc3e91e55c16f9c13f00fd2e2155002fd71941cb932c72fc8a2133b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 5172 bytes
font_01_sfnt_off0000c2aa.bin
b40ecd02587b066da65e0146468b3e64d923d877edf1d1aaa0c9be07d203168e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 9916 bytes

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