Malicious PDF — malware analysis report

Static analysis result for SHA-256 068475364f971f64…

MALICIOUS

PDF

60.1 KB Created: 2020-08-14 07:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8f74185caba4aa1fda7618a49cb663b SHA-1: 1eb7d0af60d47ca37ecf7489569e8e41a19b2db8 SHA-256: 068475364f971f6476bff0190efe38558529a18770aff1a8ea192a83239528b8
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a book on combinatorics, likely to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness, and the presence of a redirector link suggests an attempt to lead the user to a malicious site.

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/wb?keyword=livro%20de%20analise%20combinatoria%20em%20pdf
    • http://files.doctorandrewwu.com/uploads/1/3/2/6/132681779/kekiruruj.pdf
    • http://fodinizom.industryumc.org/uploads/1/3/0/8/130814328/178e2b029371d.pdf
    • http://files.dakinicoaching.com/uploads/1/3/0/7/130776111/1033206.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/simuburigikep.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/etiologia_de_la_diabetes_mellitus_tipo_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/binomial_distribution_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/73379741085.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/economy_wildcat_scissor_lift_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/46999438494.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gibowutobarifokegibig.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/jojorawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3414/files/root_mean_square_error_formula.pdf
    • https://cdn.shopify.com/s/files/1/0434/2248/2582/files/bokenolutefezaxi.pdf
    • https://cdn.shopify.com/s/files/1/0440/0952/1317/files/49410464518.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.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_off00009d84.bin
14f47adca9117f13adda70eddd4b8e52497c2807cd449ac627814709a227660e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D84 5440 bytes
font_01_sfnt_off0000aff2.bin
c22bbccf35064ce92435b62d28a632b06dc92e5ff8fa801a425f0dcf7930bf4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF2 16532 bytes

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