Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5b66eba763e02f…

MALICIOUS

PDF

41.2 KB Created: 2020-09-01 04:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7defe7b1efcded58131d24e1bb1a9d8 SHA-1: 23067d894e3c89cb94b5a1508a2506df4654dd59 SHA-256: 7e5b66eba763e02f8c2e4233077856ddcff59d4f648c9fd3ce183f0f0441c1af
128 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm designed to manipulate search engine results or distribute malicious content. One of the primary links points to 'ttraff.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to the embedded URL, suggesting a lure. The presence of numerous links to 'static.usrfiles.com' further supports the link farm hypothesis.

Heuristics 4

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=black+anodised+aluminium+sheet+uk
    • https://static.usrfiles.com/ugd/b8c837_33db054707b64e2e83f720bec0d4b135.pdf
    • https://static.usrfiles.com/ugd/b88e3d_06bd6ba03b6945d79d4eff7e95385a78.pdf
    • https://static.usrfiles.com/ugd/760101_fae8ed56a8f949539d1427ed957a7859.pdf
    • https://static.usrfiles.com/ugd/9b5f63_7605f9c8597546ed862f321491373220.pdf
    • https://static.usrfiles.com/ugd/4b874d_80237858a6bb402483ce8a5cce2ff2f7.pdf
    • https://static.usrfiles.com/ugd/a4d998_637a728c50f64202a931881722791c00.pdf
    • https://static.usrfiles.com/ugd/2f7815_00eca86570cb4dcab16d2b6f3628e6d7.pdf
    • https://static.usrfiles.com/ugd/15ebe2_98761a79dc894ad68a5977025acd0814.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8aeafbef4f54d0883ca3820e25ac78c.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_off000063bf.bin
3406a5dcc168057f7d717fa3318ea47307c43949676e5bea068c81ee5524c8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BF 5196 bytes
font_01_sfnt_off00007546.bin
312ad59d5ab7c515322a090ce86f470e0c1fd889c240311b4e04e5670ef26474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7546 10352 bytes

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