Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9f1666e0966835…

MALICIOUS

PDF

35.7 KB Created: 2020-08-23 18:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9974619fbbb619e0b551bcbd516dcda6 SHA-1: 99e48ded1b26ad503d47ecb7b1b9d68e9ad05828 SHA-256: 0a9f1666e09668356f96e47e1330941136fb5474428b0a68869a7aada9e19ab8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely for SEO manipulation or to obscure the malicious destination. The ML classifier 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=past+simple+vs+present+perfect+exercises+pdf
    • http://files.shop.dannysrods.com/uploads/1/3/1/4/131453577/xevepifezoz.pdf
    • http://files.santinivideo.com/uploads/1/3/1/4/131406140/wagopis-pupuj-newuvega.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9472/8103/files/gulof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/the_life_of_samuel_johnson_by_james_boswell.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0431/1000/6940/files/kenmore_he_3_washer.pdf
    • https://cdn.shopify.com/s/files/1/0439/8091/4846/files/jedobutikoroxabi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/pusuxeritewimujap.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/95178712461.pdf
    • https://cdn.shopify.com/s/files/1/0432/0785/2192/files/52539780770.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8136/files/acuerdos_de_convivencia_preescolar.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6981/files/converting_repeating_decimals_to_fractions_worksheets.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_off00004d78.bin
41d75e9c567d688f2834b95b34795c648334303f5f2c9d13e3fce47198b9df83
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D78 5428 bytes
font_01_sfnt_off00005fda.bin
2b18a79b4ff57392e9cb98ddce88816ac0390a0c2eae724c2339f0d168618d32
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 9868 bytes