Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d19fe44e1109e5…

MALICIOUS

PDF

29.8 KB Created: 2020-10-31 14:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7f07b40a5996e3f6bf00e520a4198e55 SHA-1: 2bd577b8478e5d2ef95921343da80df33328d97f SHA-256: b3d19fe44e1109e54a331d15b6ebc5f51fbe29ccc806fc22bbd53b13816e7693
114 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious due to its structure, which resembles an image-only lure designed to trick users into clicking a link. The embedded URL, https://cctraff.ru/aws?keyword=westfalia+centrifuge+manual, is flagged as a malicious redirector, indicating it leads to further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 29 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cctraff.ru/aws?keyword=westfalia+centrifuge+manual In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dbbd04.pdfIn PDF document text
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/gibefixixukajodimed.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/1/0434/4279/8757/files/89173423525.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/rifts_core_rulebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2dd1e9a-ede0-4163-b900-342aa6164a98/kanejege.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/54737069433.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8671/8128/files/service_mesh_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/90665982025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0592/6809/files/vowubutumofoduzupig.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/bibtex_to.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0300/5086/files/86428724408.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_off00003e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E52 5216 bytes
SHA-256: 1ec8a91bfce15883cd33e3db1af0c2774fa692d2194381ad19de3d27387eacac
font_01_sfnt_off00005008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5008 7812 bytes
SHA-256: 9dce5d7665527938311647bd2198491217bf5ae64a38470194a3a1f6a08b77b1

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