Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e04868570e9b4e…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 22:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83d63eb4f676b019188c764b2d622315 SHA-1: 9657f1e5c2f7f6324178dc4fac18fc362288cbc6 SHA-256: b0e04868570e9b4eeb078bb8ccc23e0c7d8053232c3b3760e1989fc1a2b2d986
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=ext+js+4+download'. The document body, though heavily obfuscated, contains text fragments that appear to be related to the lure, specifically 'Ext js 4 download'. The PDF also contains a mass external PDF link farm, with many links pointing to static.usrfiles.com, suggesting a broader campaign to distribute malicious content. The primary malicious IOC is the redirector URL.

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=ext+js+4+download
    • https://static.usrfiles.com/ugd/b8c837_ce1e48244c014206ba6b39bce20c7902.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fd34406ab50430ea2086a9692783284.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d2c8329fb094d4db01d7011dc740726.pdf
    • https://static.usrfiles.com/ugd/b8c837_531bfd49a313432182eb865a40269856.pdf
    • https://static.usrfiles.com/ugd/b8c837_8880a3000eb24b73be4e674d053a5b11.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/39775640817.pdf
    • https://cdn.shopify.com/s/files/1/0437/8260/2913/files/awg_wire_chart.pdf
    • https://static.usrfiles.com/ugd/de65f7_f07b630f31f54c9db1c616b907ef53dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a969b4a9c56432db7f779473ec23d0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_778eadfd0cd3492fad1978ab6ba96529.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecde8617b58f4ec8acc2359192e4fa6e.pdf
    • https://static.usrfiles.com/ugd/345929_a849c7f5cdcc4ba4834bfa987370f2e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1170fe5bb9b42beaf18c4ff951fc045.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_off00005bb5.bin
d055b173c1845a6eb8e07917faad0bdfac5942ca726fcb7adb053b2168239b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB5 5004 bytes
font_01_sfnt_off00006cef.bin
83e950692c5c4045085de34ed4a7566a773d36dae7b2126f175693619591fc0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEF 10568 bytes

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