Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d6da80222a094a…

MALICIOUS

PDF

39.4 KB Created: 2020-11-06 09:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d2eaf4e66ad75488508ef79e9b55ad91 SHA-1: b77d3c3b6ff3f1f532fc978962e69fa5db039a94 SHA-256: 31d6da80222a094aa1bfb54c866088085b1e822b8a79bb45405c03f5c342116e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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://traffmen.ru/123?keyword=cleveland+county+schools+careers In PDF document text
    • https://fuwizugirizuj.weebly.com/uploads/1/3/4/6/134611345/9934666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f87163e365f8.pdfIn PDF document text
    • https://juzapojoxop.weebly.com/uploads/1/3/4/3/134370352/nupetoruk-xajotoxijo-numilu-medozasotagef.pdfIn PDF document text
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/sumuniv_lenosugumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/gupepulij.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/98384732696.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/kanevami.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/witch_doctor_costumes_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/tnpsc_assistant_system_engineer_study_material.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_off00005c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C86 5096 bytes
SHA-256: 8b37c8a33a9b4d036efb10c8d1781abdd956c17741bba5d49bfa565a4ee62d17
font_01_sfnt_off00006dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD5 10364 bytes
SHA-256: c42ab6d8b28b67bc610e126afebae8bf11f811b25c72b47dc535df76a5758f82

Open this report in the interactive analyzer, or submit your own file for analysis.