Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff196d1e5a3d6bfd…

MALICIOUS

PDF

44.7 KB Created: 2020-10-27 22:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 70b4f1dae132ab349579d76721b368ee SHA-1: 33c7f417932323a310e4c3039cec0e00ee039467 SHA-256: ff196d1e5a3d6bfd2cc707256e7069b0d8cf7182c40a31a91079a2be38ea0ca1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=walled+lake+central+marching+band'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links, many of which are to benign Shopify domains, but the primary redirector is malicious. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=walled+lake+central+marching+band In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f88ce7eadcbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5f8e5a12a7a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f8f92f05a5ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f8c4caf01efc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5f8c651f0ded4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8859/1006/files/liquido_cefalorraquideo_pediatria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6101/0328/files/6904290054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3902/0950/files/29317509511.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/80921176961.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/roxexit.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/braverman_deskilling.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6967/6961/files/33013600079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/sears_air_compressor_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9918/4551/files/bolokimawato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/niwugugumuvuvodik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3225/4376/files/spider_coloring_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3105/7816/files/4560240890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9218/3702/files/nivapalizunevimadawirata.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/11225243663.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/60244668682.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A64 5392 bytes
SHA-256: 2e2e76a6b265599149f56b9b59f18a2a776580b959d2a398f647a97e3b6ad071
font_01_sfnt_off00007c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C91 11600 bytes
SHA-256: d40966b85a37fbfc8dd89920c0eae9397e5c0eac81391345be6f9fda42a60511

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