Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f471bc8e8a09216…

MALICIOUS

PDF

43.7 KB Created: 2020-11-09 08:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b252539896c76e041648e0673344037 SHA-1: d121ebc9d273271452765c484d2595fdd9baaab1 SHA-256: 9f471bc8e8a09216d9a73779062d1d0669eb8d4d324753a06da577be22625848
94 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The embedded URL, https://gettraff.ru/aws?keyword=gauss+seidel+method+matlab+code, is likely used to direct the user to a malicious site. The ML classifier also flagged this PDF with high confidence, suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://gettraff.ru/aws?keyword=gauss+seidel+method+matlab+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5fa12ef84c2c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f874b33099d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f9164304e97f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fa8c2d6e7059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5fa0fb0bb7ecf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2d49cd92-2c28-4eaf-b2bf-e5a9db6381a2/41038965752.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/wwe_future_endeavors_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/66871580924.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/cell_structure_and_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f76b038-8528-4d0a-b9ea-b210dac43fb9/avatar_the_last_airbender_elements_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a894ca-1e5f-4dfd-b9ff-3f1d5e77c990/55164363566.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE5 5032 bytes
SHA-256: f8a4659382f4fa21415979caa2bf715d3acd6e6a5aedc138ecd8a62e026d29d2
font_01_sfnt_off00006d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0A 11448 bytes
SHA-256: cb88983215e11437d342142ce890f3bb41215656b76d890e8b13a7f4b0ac1413
font_02_sfnt_off00009424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9424 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f