Malicious PDF — malware analysis report

Static analysis result for SHA-256 82820b6648022b12…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 08:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 926af5e96592a0ca3f5650aaf20cab49 SHA-1: 28b4e70e2ca2e013c47166686b28374374dad395 SHA-256: 82820b6648022b12f64339a7e297461fe4356f528c4e32cddf90fb7385d2c2f8
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of the primary links, https://ttraff.ru/wix?keyword=simple+past+passive+voice+questions, is identified as a malicious redirector. This suggests the document's purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. 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=simple+past+passive+voice+questions
    • https://static.usrfiles.com/ugd/078c79_3256caecec3c45458c6eb04f4001d205.pdf
    • https://static.usrfiles.com/ugd/b8c837_c133c3002dec4f17b48e774530e43a02.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7318f5f86d74ce6b90b071dcefc3fb6.pdf
    • https://static.usrfiles.com/ugd/33a2e4_d5463eb518c7443895dd9de7c19cea15.pdf
    • https://static.usrfiles.com/ugd/0a0016_449d3f6184844ae09ed68dcbd7bb21dd.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/39047053453.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/weluza.pdf
    • https://cdn.shopify.com/s/files/1/0436/0906/3582/files/kupalotiruzon.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/jusogamirupezafajinof.pdf
    • https://cdn.shopify.com/s/files/1/0447/5496/0533/files/char_broil_performance_vs_signature_series.pdf
    • https://static.usrfiles.com/ugd/dd4472_c6ed81a2d38f4d47831de846d0594240.pdf
    • https://static.usrfiles.com/ugd/225520_10c13ac37d164513ac0051e5e4c4dae9.pdf
    • https://static.usrfiles.com/ugd/c1de29_cfb35b4ae63546aca516a777bee5670a.pdf
    • https://static.usrfiles.com/ugd/105a8c_0195a70e9f784eaf923f4ff388e8f06d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f1da4ce6619429eb17f13416e33ad5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb28dda2c08d462290a8804f671fe9d8.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_off00005e83.bin
d995477cea159442b920ecf0cb5c3e99c118ef7f340b58c11c54e38574f5abdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E83 5272 bytes
font_01_sfnt_off00007064.bin
81deb80093cccde179383c65aa42958d7161b405567cbb5608dd0e1b4697932d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7064 10164 bytes

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