Malicious PDF — malware analysis report

Static analysis result for SHA-256 565332e743d2dda9…

MALICIOUS

PDF

44.8 KB Created: 2020-08-29 12:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08cea21f318f46e5425888558a54abea SHA-1: cf5af1c40148d017ba4d182c3315594be31113f1 SHA-256: 565332e743d2dda9b660e94e1416c663d3fcaf637c229b968e8863ada57474d9
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. This URL is likely part of a phishing or malware distribution chain. The document also contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm or SEO poisoning technique. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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=effet+de+levier+%25C3%25A9conomie
    • https://cdn.shopify.com/s/files/1/0437/7221/5458/files/54509876911.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/python_string_format_named_arguments.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/adams_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/psd_banner_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/xumononaxi.pdf
    • https://cdn.shopify.com/s/files/1/0463/0754/1149/files/70403958288.pdf
    • https://static.usrfiles.com/ugd/b8c837_95e3fd9b63754def9f9f155dcc2c4c7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb28072733b24862b11105ec8d3431bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_373ce20d6860424db49265a61ef8f6a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_85a02cd4e13f44c7a75ca7189ebe6650.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cfa656bb47247d894b66cbc9449a514.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_off00005475.bin
6bf25fde3c431dfe47837066876067dee7284349f378f0a371e5aca74d7c229a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5475 4940 bytes
font_01_sfnt_off000064e9.bin
d9e547222fb38a3b8cb6c41e4cff057b215126c29e4d60e3be660837743aea67
pdf-font-stream PDF embedded font (sfnt) at offset 0x64E9 13800 bytes
font_02_sfnt_off00008ec6.bin
7c1538fb306f3f79fe5feb072e9c27a44d3530a0c4addf867d004c073b1059fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC6 16384 bytes