Malicious PDF — malware analysis report

Static analysis result for SHA-256 b325f462862f5a15…

MALICIOUS

PDF

40.6 KB Created: 2020-09-01 06:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01818c9bd70a2fccc25748c298743966 SHA-1: 134058774a4c61c56ce89b91d60ea54620bf3ecf SHA-256: b325f462862f5a15343a181f41829652aee305949b587628f2400d512c7ae6e4
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for 'twin bed sheets canada'. This suggests a phishing or scam attempt. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, indicating a link farm strategy. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=twin+bed+sheets+canada
    • https://static.usrfiles.com/ugd/b8c837_fcf3dfdbe8d142f7a2f21ac2f973041f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddf15af9aa0248c1a4f9dcf97db101ae.pdf
    • https://static.usrfiles.com/ugd/26481d_48e9ea824d0e45ee81e4f84af11be936.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdfc22dafde64875ada98deafc55b3ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_328a4f8703e14f3badfda2f94947749c.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/rupawamuxusedefo.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_8c0602adeb754d209144e7dfa32b020a.pdf
    • https://static.usrfiles.com/ugd/ea2f88_b79132cc4b39487d9326c680257be2ac.pdf
    • https://static.usrfiles.com/ugd/162fe6_ba288cca38d3460595aef5cdffd0bf88.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/bella_y_la_bestia_cuento.pdf
    • https://cdn.shopify.com/s/files/1/0435/6413/8651/files/workplace_wellbeing_questionnaire.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e87.bin
69479bccd820c80508577ac6063bdbe0d2a35e03ed6331c35895c4732f1ac7fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E87 4760 bytes
font_01_sfnt_off00005eae.bin
c47314a27ea4e9d49835ab2a59f3e263498dd44586a92d6890b2f980eb8b0a14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAE 13196 bytes
font_02_sfnt_off000087e6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87E6 4324 bytes

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