Malicious PDF — malware analysis report

Static analysis result for SHA-256 847f3f639f33c0e7…

MALICIOUS

PDF

40.4 KB Created: 2020-09-02 12:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 749f6e701948335771af86111a1fa956 SHA-1: 50757a0a952fdadbe97436cfb0b24a95eefe5dd5 SHA-256: 847f3f639f33c0e79b53843373fb672b3461dd9f79fba91098c1008518da7c54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier as malicious and contains a large number of embedded links. One of these links, 'https://ttraff.link/wix?keyword=desi+brahman+na+song', points to known malicious redirector infrastructure. The document's structure suggests it is designed to host a link farm, likely to distribute malware or conduct phishing attacks.

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.link/wix?keyword=desi+brahman+na+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a298ce_b57a27f51c534ffc84791916590d12ce.pdf
    • https://static.usrfiles.com/ugd/78c764_1e2f0331468d4ea0aafc7565dfd3e20f.pdf
    • https://static.usrfiles.com/ugd/f63f29_d55ba1e517824ccb9ec038e6b28e1b57.pdf
    • https://static.usrfiles.com/ugd/f96b02_1a55b14b0d1847ddb861060cf02e6174.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8349/files/84037172096.pdf
    • https://static.usrfiles.com/ugd/f459ea_d8a382ae579f4e1ba6f1d47f32fd1a49.pdf
    • https://static.usrfiles.com/ugd/9ea91e_22bb94edafb84395b31e744f1adb4b95.pdf
    • https://static.usrfiles.com/ugd/25c42e_4dd8df2b4cfe4f198727148bd193d449.pdf
    • https://cdn.shopify.com/s/files/1/0438/8660/8552/files/32429324438.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/scatter_plot_in_python.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053b7.bin
ebac3fb0637d703df7061df3cb162d21c76fb2fda975842ccda4766014a776d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B7 5204 bytes
font_01_sfnt_off00006545.bin
d171091be6e910a7d65b81d0f1b6479fae98b5639fb7483232d4d869cc5716c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6545 15508 bytes

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