Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71059f1260deb50…

MALICIOUS

PDF

44.7 KB Created: 2020-08-29 18:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20203398acb1c57f1b40108fd99004ad SHA-1: b28f32ff0772d9476a80c4df879fda98a8bf8d7f SHA-256: a71059f1260deb50ea25fbd3bba07af9e8e65f007a457763afe366bb5b91966a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=search+inside+yourself+pdf+ti%25E1%25BA%25BFng+vi%25E1%25BB%2587', which is flagged as malicious. This suggests the document is designed to lead users to malicious content through a link farm strategy.

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.cc/wix?keyword=search+inside+yourself+pdf+ti%25E1%25BA%25BFng+vi%25E1%25BB%2587
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/jabezitejetajuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/2402/1664/files/libuz.pdf
    • https://cdn.shopify.com/s/files/1/0463/3093/7506/files/vetetap.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0fd6ca95ad748b29772bbf24b52a278.pdf
    • https://static.usrfiles.com/ugd/b8c837_114e5d7d0dcc4541a4bc9ba8b55104f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_04b691418b70453aa3f836a0939145b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_192c92c0d559484dac893d6c930670a3.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/nilipuvapezuwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1754/files/12713243774.pdf
    • https://static.usrfiles.com/ugd/b8c837_33d6ea8ffef647bb97fa56ab5b815a00.pdf
    • https://static.usrfiles.com/ugd/b8c837_e83cb3f7aa5748c1ab91b8ec145a8655.pdf
    • https://static.usrfiles.com/ugd/e73fea_a16fdd9b046149bb9ee583c1c2ac512f.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_off00006b9e.bin
1f8c94a87c324c628aaf8a2ce0974b08f1fed69de3e45b2df4e152deac9aa9dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9E 6020 bytes
font_01_sfnt_off00007f88.bin
410c56210e5544e05e1c6a6425483d94b5f294583b1f0aa22e64a1161fb502a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F88 10876 bytes