Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c860a023af0509e…

MALICIOUS

PDF

41.5 KB Created: 2020-09-19 00:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24bd9a841697ba12d71a2dde65251a23 SHA-1: 430eba16036e8e84f38dcafdeaba5341fcb9647b SHA-256: 0c860a023af0509e6c767452ce766904493e60cbe89f11bfd65460f4e0dfaca9
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of hosting numerous links, likely to obscure malicious destinations or engage in SEO poisoning. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect users to potentially 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.club/wix?keyword=chapter+6+study+guide+accounting
    • http://files.elevatednaturalhealth.com/uploads/1/3/1/8/131856491/385936.pdf
    • http://zedega.tuscarorawildlandfirecrew.org/uploads/1/3/2/8/132814938/6783286.pdf
    • http://files.jmptattoo.com/uploads/1/3/0/7/130776298/7575081.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/18920330768.pdf
    • https://cdn.shopify.com/s/files/1/0433/9820/1502/files/tuzuxugukuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2193/files/death_note_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/4911/5029/files/amar_chitra_katha_stories_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/magizokoluredofet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/zivexo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdf
    • https://cdn.shopify.com/s/files/1/0447/1855/5292/files/cost_accounting_financial_statements.pdf
    • https://cdn.shopify.com/s/files/1/0434/2258/0886/files/vosifip.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/29883913589.pdf
    • https://e6e4acd8-5613-4d11-baf4-f06bd4ca461a.filesusr.com/ugd/805d2a_526de87d384b4b2eba04e990c2ef94c8.pdf?index=true
    • https://ca1b20b3-a59f-4a7f-b117-782c55d12975.filesusr.com/ugd/2e16aa_59f13711a728496d80396945a7246092.pdf?index=true
    • https://3e2286a8-dd05-48e1-9e9a-644a1d0eacff.filesusr.com/ugd/dcbeda_27d01bf617384aa1a396477853a4ca1a.pdf?index=true
    • https://a3c4841b-7b23-4e40-92de-95b773968cdb.filesusr.com/ugd/891219_c7f2237d372547219647feb4fde8ef17.pdf?index=true
    • 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_off000064b8.bin
ac2dc307371c80d74a6764f346dccd070950447425a9c3bffc13ec6b9046df65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 5464 bytes
font_01_sfnt_off0000774b.bin
fad77049a13b492c22ce5287e9b2b8c9f46e4d48c7568ba864cc4868e2c2614f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774B 9848 bytes

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