Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a472d79099d6a87…

MALICIOUS

PDF

72.7 KB Created: 2020-08-10 11:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 063f3f9c9ca9d89732a826ff18840856 SHA-1: 0103d9f1132bd140ad98bd7fe469a912bf6caeef SHA-256: 5a472d79099d6a87c3091d9b7432c58ce5420bc1a6a21727d747140427994008
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=peque%25C3%25B1a+enciclopedia+de+aperturas+de+ajedrez+pdf'. The ML classifier strongly indicates maliciousness, and the document body, though corrupted, contains text related to chess openings and the wkhtmltopdf application, likely a lure.

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=peque%25C3%25B1a+enciclopedia+de+aperturas+de+ajedrez+pdf
    • http://files.joeesjourney.com/uploads/1/3/1/3/131380616/3992733.pdf
    • http://tibalib.mavensmarket.com/uploads/1/3/1/4/131407921/rarabositeweva_pumivax.pdf
    • http://files.tambo.ca/uploads/1/3/1/6/131607544/zalofumakunak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/22197082154.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6312/files/99263272526.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/fujizewalekulezalodiz.pdf
    • https://cdn.shopify.com/s/files/1/0439/9159/7214/files/3712621266.pdf
    • https://cdn.shopify.com/s/files/1/0429/2342/5955/files/64659086845.pdf
    • https://cdn.shopify.com/s/files/1/0451/1835/7669/files/kenmore_sewing_machine_model_385_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/2183637483.pdf
    • https://cdn.shopify.com/s/files/1/0431/0325/6737/files/lozelamiwujasuriwe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/43373657833.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/keletogakop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/43582143574.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/88584341298.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_off0000d9fb.bin
ef23cf6dd5de980f93988909943d1eb4824d7be4e90eafdead6d1073634b393f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 5616 bytes
font_01_sfnt_off0000ecee.bin
d7eb22eff7aa84b98b4c859c125853c73e603b02d6abea0da598231c37f1e611		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 11856 bytes

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