Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fd6d79577f2329…

MALICIOUS

PDF

66.3 KB Created: 2020-08-02 17:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc39ad0a20a5a78dd7791a69c45b7a88 SHA-1: f534c269f9e0430993de3ad58d9e451b746fbe2e SHA-256: 03fd6d79577f232995e4cabd26a78970035156271e7e5152fbbe3bc2eb0f28aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with 28 external PDF links, many hosted on Shopify, and one critical heuristic indicates it links to known malicious redirector infrastructure. The embedded document body, though heavily obfuscated, contains a URL pointing to 'ttraff.com', which is flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, suggesting the document's primary purpose is to redirect users to harmful content.

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.com/pify?keyword=international+calling+codes
    • http://files.mrdoran.co.uk/uploads/1/3/1/3/131383330/6336880.pdf
    • http://files.koshercorner.org/uploads/1/3/0/7/130775784/sewon.pdf
    • http://files.kamariawilliams.com/uploads/1/3/1/4/131482822/gitavozibo-xivuru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/63896580312.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/74920293568.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/pidikubajipitebawuxigo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/zuxowulapavefi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8947/5237/files/4336329383.pdf
    • https://cdn.shopify.com/s/files/1/0434/9096/7714/files/49745439636.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/ganularafubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/pobevaxarifudojavinerepup.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9759/files/20231107602.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.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_off0000ba5f.bin
09365fe46e5aa19cddb36670a94c00261f18b085000d6d8bd212b24dbea1ab1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5F 5044 bytes
font_01_sfnt_off0000cb8c.bin
a1f1e6c285ed216c46848c9b11c7181cfe29d560bb23dab360b7d587f0294604
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 16048 bytes