Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe963b2d8702adc4…

MALICIOUS

PDF

44.3 KB Created: 2020-08-29 05:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22f3f910e2ca4ca394d60c17df704015 SHA-1: 90b0ec4d86ca6069a11700523a17d4b5000cf396 SHA-256: fe963b2d8702adc4c3cb371cb07987012d381d615123801108594ab4e1f4956d
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of external links, characteristic of a link farm. One of these links, 'https://ttraff.ru/wix?keyword=klipsch+r6+ii', points to known malicious redirector infrastructure. The document body appears to be heavily obfuscated or corrupted, but the presence of URLs suggests a delivery mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=klipsch+r6+ii
    • https://static.usrfiles.com/ugd/b8c837_46ffed815959402a96d0ae1f5e3eee2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0852081b39c14d01beebae5b6fbdd89e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0c9fc0cac2149649eced41ed819b38c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f8021d585d54564b8246edea1919694.pdf
    • https://static.usrfiles.com/ugd/b8c837_78be48e3f329473faaf62ddd94226a5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e670042cac344c49b87044d1014db7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_275842cc50904e4fadd47f82c6698bc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba92fc1e47574f87b021a1195af94fb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c05a9009fa644067b1e0193020c6a0eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_64c57f553d4945a384cc44f40983c5b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b14eb682f704021adc5dfbf9910e8c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b67e69f875a5445e8638a58bcf8d738a.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ed2.bin
24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED2 6588 bytes
font_01_sfnt_off00005f4c.bin
61531d187ad8df2aaca9976fd5d54224a834b0c1767d761cff4ee00f4b8bbb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4C 4932 bytes
font_02_sfnt_off00006ffe.bin
2cfc5018118ae6501f37f7103bca203dc55f612fe7660e433d53e59a06d13ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFE 4392 bytes
font_03_sfnt_off0000812b.bin
0b79f4ef2a0fdc349cc5039409d115997b952d17b84b44fd44d45c92d21ad172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x812B 10228 bytes

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