Malicious PDF — malware analysis report

Static analysis result for SHA-256 445b9fe8c1477b01…

MALICIOUS

PDF

47.4 KB Created: 2020-09-30 23:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-12
MD5: 7bf6212dc92056339e1b395a473b536e SHA-1: b982dd74c5ca04e3c234983fa7ef45673d1153cc SHA-256: 445b9fe8c1477b01feb870dd93a9248d7d036f6d0425d2dc1a5a47a21350ba06
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure known to host malicious content. The document body, though heavily obfuscated, contains text suggesting a 'quiz' lure, which aligns with the heuristic findings of a malicious redirector and an SEO link farm. The presence of embedded URLs and the ML classifier's high confidence score indicate a deliberate malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=anatomical+terms+quiz+pdf In PDF document text
    • http://files.chrismok.com/uploads/1/3/1/3/131381109/9626153.pdfIn PDF document text
    • http://nibula.nc3family.org/uploads/1/3/0/7/130739553/6182996.pdfIn PDF document text
    • http://files.nanosc.se/uploads/1/3/2/7/132740435/7586498.pdfIn PDF document text
    • http://jiroxifak.lexingtonservicesolutions.com/uploads/1/3/2/7/132710567/fojaxub.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/dbdc67f9-a97d-4e65-9f0a-f68c9c9068a0/nijowiredetit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3676ce-208d-4d54-9f80-be7a16fb48de/38418888270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87e585f-7fd8-43f6-98e5-4b31b2686937/65516412107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1676/0729/files/97448146066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5488/1185/files/96548728380.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7716/3416/files/77937256717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7079/7462/files/hair_cutting_photo_editor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/36652235110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09567050-4275-44fd-892b-4536644a326c/gepolazub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15e6ef7-0d1f-4463-b5ed-6186f18a4deb/furunusejukubibakaxuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6c2a5c-0ca1-4c1b-ab1f-d803db233beb/43333592733.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_off00006cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDA 5348 bytes
SHA-256: 1d3a42c22c7b857f00e156cc6ddcfa0fd6fe2b9a04f7567ebc86c3383d2a548c
font_01_sfnt_off00007eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEA 10388 bytes
SHA-256: a89a9e896488c286f1b3d231b121db43e2d84254fd49ebab26952e2381e9a52d
font_02_sfnt_off0000a245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA245 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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