Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e076bda37ba2f9…

MALICIOUS

PDF

45.8 KB Created: 2020-08-31 01:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ae4d3e02fb1c2e56cedeb410af138ab SHA-1: e5e82a05c593590b009c2c0de7ca9af293defe63 SHA-256: b4e076bda37ba2f979595a3269013dd2cf40c4e3dc2946ab306ee530a3259669
120 Risk Score

Malware Insights

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

The PDF file contains a lure for a "love language test" and embeds a large number of links. One of these links, `https://ttraff.com/wix?keyword=love+language+test`, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links pointing to `static.usrfiles.com`, which is flagged as a link farm. This suggests a social engineering attack designed to redirect users to malicious infrastructure.

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.com/wix?keyword=love+language+test
    • https://static.usrfiles.com/ugd/9ff9b8_93fbbe1031ed48e2bddcd1b93a3695bf.pdf
    • https://static.usrfiles.com/ugd/2b3f46_681b7a0e293d41289ee406f67d99b62e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abb086997794cdb867f6fd60c66575f.pdf
    • https://static.usrfiles.com/ugd/b8c837_97576efa759d4dea8604a39c453731cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_370d3142b2dd427b91091a4ecdfb54ec.pdf
    • https://static.usrfiles.com/ugd/f515ca_9fe08c3b3ca24182b149bb86224d3fdb.pdf
    • https://static.usrfiles.com/ugd/22bf55_c7d9a429f4584fcb92fe0e95a916deb8.pdf
    • https://static.usrfiles.com/ugd/67e251_9db64e0056654c3382d3cbaa942b445c.pdf
    • https://static.usrfiles.com/ugd/2c8d66_b956ab532ec542e5a670185d1c173175.pdf
    • https://static.usrfiles.com/ugd/cec570_0d168e3fc0e94641a65b07d74f070f2a.pdf
    • https://static.usrfiles.com/ugd/5438e3_1ad90bd9de344330ab198a62951c9d0e.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_off000069b7.bin
5f83af31addba583155abdaea5f8b6316887244bd3a0a66b18c756bb678dc834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B7 4592 bytes
font_01_sfnt_off00007975.bin
be690e457976fa49ef079eb584739d6a6ae3140b759500110f40429f7d121224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7975 10552 bytes
font_02_sfnt_off00009d03.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D03 4324 bytes

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