Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfd8c50dcdd2316…

MALICIOUS

PDF

42.3 KB Created: 2020-11-05 10:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aa0ae4ef8eb803423d02c2e536aadcfc SHA-1: 9c72e3d4b57b5da78b00e5cd493e5bde241ddec1 SHA-256: 1bfd8c50dcdd2316565e6f1f630fa4fc8bf21c60f5c643f652d25bae039cd4e9
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.ru/123?keyword=how+to+build+the+wind+staff In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5fa0d1e0cd9d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5f9b391ab7915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f8b5c3f973f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f90b2426cdbb.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/gumegulaxi/murumi.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/mathematical_interest_theory_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b05ee7-3c8e-4ce4-985b-43ab3a6a2a0f/piroxorivolewuledi.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/56172351540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af17bdf0-0717-4a7e-9902-2462865b4ad2/vemufebagovutem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ee4e1d-7538-4daf-9f54-3c8bed4ef70b/99282193006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab9e0dc-30c1-4fbf-84ea-4720f140e747/gitazuvuzisuxataz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df740d77-0bad-4cbf-b1af-cd6824bb2007/mefajuzujisepebekesiwaso.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/brackets_autoligables_vs_convencionales.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_off000067ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67EF 5092 bytes
SHA-256: 00f792e563f157de8fbfc5c33f8dbe244b0af6f995e5c5aa67ad92044a3e9f3b
font_01_sfnt_off0000794a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x794A 10248 bytes
SHA-256: f970150565fcfed42315500fd4cfb4085792c4effc9ce7531a2c7ec374df2c98

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