Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0851166868428f…

MALICIOUS

PDF

40.0 KB Created: 2020-08-31 15:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d23d3c5ef127be28abbc9b281f9da1b SHA-1: c3f9123c7f67799a74855658a15e8932528d6d71 SHA-256: 9b0851166868428ff34a6f8c85842345c57e5172ce38c04c32dd323aaf3965f5
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=adding+mixed+fractions+worksheets+free'. The document body, though heavily obfuscated, contains references to 'adding mixed fractions worksheets free' and includes the malicious URL, suggesting a lure to a malicious site disguised as educational 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.ru/wix?keyword=adding+mixed+fractions+worksheets+free
    • https://cdn.shopify.com/s/files/1/0444/4468/0359/files/extended_euclidean_algorithm_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/greasing_the_skids.pdf
    • https://cdn.shopify.com/s/files/1/0434/5508/6742/files/wafaweditodumusalosagu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/jutotatiwisimekanufiziwap.pdf
    • https://static.usrfiles.com/ugd/9734e7_0a83072a1970408fb228bef636df041a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6a9e8a912694c90b04776d45c4eebdb.pdf
    • https://static.usrfiles.com/ugd/c162b3_c72405e09b6940b69e9e3afede9f2daa.pdf
    • https://static.usrfiles.com/ugd/2e79a6_d050242eeda54e06b4f53277705f8f4e.pdf
    • https://static.usrfiles.com/ugd/07625c_58e92b7e23674194926c76772e539239.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_da4385daf5e84ab1b7a6a10cfc4f861b.pdf
    • https://static.usrfiles.com/ugd/e4a001_d65ef188fb184957b167b4c6f1defa2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c308b80a8334f6cbbac0840859dd934.pdf
    • https://static.usrfiles.com/ugd/6c98bc_34e6f0a1eff84b12868a3120aec411a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5d220dd90284c729c86f96fde353a67.pdf
    • https://static.usrfiles.com/ugd/d54300_01e1ad4a6f4a495cad5994ab6f446d87.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_off00005f05.bin
a2cfb50f055355694b4acca36db28b3ed889f2448e3f55c44ebb7431379d0b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F05 5616 bytes
font_01_sfnt_off00007218.bin
bc8426abacf6b1787034147c60993ffc63a2ae6a471ec99920d5285456ac6346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7218 9632 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.