Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e0da954cabf43c…

MALICIOUS

PDF

31.1 KB Created: 2020-10-29 18:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f26d1ae836bfb10ac4ca5af5678e1ed8 SHA-1: 93bcf96db2892cb648361177d62fa4373f1e575a SHA-256: c9e0da954cabf43c718b763543d0ca3b05655fa41b1af88f0fd00abbe3877da5
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector. The ML classifier also flagged this PDF as malicious with high confidence.

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://ttraff.link/123?keyword=bose+solo+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5f87b1ae13926.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/nidisetati.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/2137176.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/libosokune/werutosisatifufemivedemo.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/66287837641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d3d15e-5375-4e23-b117-d3b848952a25/superhero_mod_1.8.9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/43695392077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f40ba9-4ac2-4822-8930-e5c7c65c62e6/67933027490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cc44af-e157-4d62-93c6-fd84938954b8/34541211466.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/jizifupesositezopafuzilut.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/wisagudifusowujito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f34f2c1-de23-4a8e-8150-9b119a7494cd/kopiwifosematagedurana.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_off00003fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FB7 4784 bytes
SHA-256: b93ab257010c54b7e87fae1cb95369884c2d6bc14fa87ec4d525aa50ed53b164
font_01_sfnt_off00004fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE2 9388 bytes
SHA-256: cf167e9337c2f920521ea1d9979070e908bcd884a921020586330705d8e59c4c

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