Malicious PDF — malware analysis report

Static analysis result for SHA-256 239f03458d19a0bb…

MALICIOUS

PDF

39.2 KB Created: 2020-08-30 23:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a5eddae580d7232d3efaca9ac76ce2b SHA-1: 0a116b2d5df55f9e7f92ba0c3a0ecf8b26de6906 SHA-256: 239f03458d19a0bb64c044772dd640720804e4fe0dd02f48acff2880dd6678a8
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=software+machine+edition'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to static.usrfiles.com. The document body, though partially corrupted, contains the same redirector URL and mentions 'Software machine edition', suggesting a lure to a malicious site. 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.cc/wix?keyword=software+machine+edition
    • https://static.usrfiles.com/ugd/bae363_44b34f26b64b43aeb474877b41c999ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a29c14bffb44ce28fe3157b1f5f3a50.pdf
    • https://static.usrfiles.com/ugd/5ad03d_6e6f08fe6a3643d19e4c200341080135.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ce93d7e56684d80976aec5ef8e902b1.pdf
    • https://static.usrfiles.com/ugd/7f16bd_b8afde8d4eb4450994b11af84654391f.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/zofogonumujemapar.pdf
    • https://cdn.shopify.com/s/files/1/0464/7183/9896/files/nugijifipekuxis.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/wajuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9320/files/23372987287.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_off00005cb5.bin
15dff4e8e6630269b2cfee9f651635dce56af02800eb83502381961fbe635b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB5 5248 bytes
font_01_sfnt_off00006e6e.bin
3d78f9e03da870a1ed242b297f11e86639bf516e5f67f3f3ff91e0e6a94c76ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6E 10084 bytes

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