Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74da4b6a18942e8…

MALICIOUS

PDF

48.1 KB Created: 2020-08-17 05:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7df62f0786f1d92728920c5b81f92fc2 SHA-1: bd7b0bd251f1e4b0eb608f58d9c26f4f7542e9fa SHA-256: a74da4b6a18942e84473aee745e45701c0411e495d34358ed374d752ccc9546a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristic. This suggests the PDF is designed to redirect users to a malicious site, likely for phishing or malware distribution.

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=basin+irrigation+pdf In PDF document text
    • http://files.blackserpentpress.com/uploads/1/3/0/7/130775866/27f8c.pdfIn PDF document text
    • http://valotamej.gorgehcfa.org/uploads/1/3/0/7/130739430/8234369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/93883503473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bijuwosozawubuvenokuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6442/5634/files/ordering_decimals_worksheets_year_6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/birmingham_cycle_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/cholesterol_lowering_diet_nhs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/87997280175.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/44660705976.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9795/6258/files/handbook_on_measurement_assessment_and_evaluation_in_higher_education.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6338/4991/files/kofewitudiloziluwisaka.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F05 5224 bytes
SHA-256: 4e2980c1d2d2bb9fb56b7cab71d6c7740b8b936529378fc5bbab8852c353b9d7
font_01_sfnt_off000090d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D0 10284 bytes
SHA-256: a2504e6005a4aae647c9a660aae9effe23e5d46d74dca02eec04d514143dd36d

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