Malicious PDF — malware analysis report

Static analysis result for SHA-256 109c6e889404034d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-10 03:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf5aa3b96faebcc9d5f64ad4618a408 SHA-1: a806fb87c4e8cf1e11bc0ae51d7d99597c032e49 SHA-256: 109c6e889404034d0f27a2cdff83c7ef38223cb74dc7c85bb36eb583a99e47e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=catherine+millet+pdf+gratuit', is identified as a malicious redirector, indicating an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=catherine+millet+pdf+gratuit
    • http://muzitadu.cspkids.com/uploads/1/3/2/8/132814930/b94b4.pdf
    • http://files.betinamarcolin.com/uploads/1/3/0/8/130814229/zidalapizeda-bupevojebavuki-jumolesubew.pdf
    • http://birasemu.amandaghahremani.com/uploads/1/3/2/7/132712615/favalakivu_kunevibuwamigu_romuzinoze.pdf
    • http://files.parkerart.ca/uploads/1/3/1/4/131453267/wowufiribajo.pdf
    • http://files.silvermineguild.org/uploads/1/3/0/9/130969545/4555573.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/punjabi_last_names.pdf
    • https://cdn.shopify.com/s/files/1/0436/2321/9363/files/abby_s_studio_rescue.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/84211510956.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/gomiju.pdf
    • https://cdn.shopify.com/s/files/1/0437/7827/7525/files/dt466_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6049/3465/files/budgeting_and_financial_management_in_education_noun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/poluleja.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/rabipudipojoxelaluf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/depazubuvupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/problem_solving_steps_in_computer_programming.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2193/files/zavojonukorux.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_off000064b5.bin
4982464168d1ce34fc5cdfcee5e77aed4ed6dcef8553f87d27fe7d82a2dff7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B5 5184 bytes
font_01_sfnt_off0000762d.bin
1a69920e1b7012e13e3b7741da31d52ce3d7033e344dc7772bcf10f11c61565c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762D 10568 bytes

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