Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b02a09887575388…

MALICIOUS

PDF

40.2 KB Created: 2020-11-05 02:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 82ca2868e2e01ef4eda960f627b2126d SHA-1: dda5359b720c4b5586ba66f722fc13f78b1b5343 SHA-256: 6b02a09887575388e45df4148fe232cddc22f78f8c1b320bc52b7e509a118d07
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be a link farm or redirector, likely intended to lead users to malicious content or phishing sites.

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://gettraff.ru/123?keyword=special+segments+of+triangles+worksheet+notes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5f99958bcbc52.pdfIn PDF document text
    • https://libizewixowu.weebly.com/uploads/1/3/4/4/134432873/1c6331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f877a776c98c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f8aa4f74a1d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f8d419be77f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5f99410ac29e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb7d716-158d-444a-b333-f965871bf44b/zenibuzalolezetuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595b79ff-a5ab-49ff-b97a-54f34b75c3f1/momezovidomor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9116fea-2c4b-4bfd-b27d-e06065488436/vumixozuzafexodafek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679f283a-01c4-4da1-962c-8739813c61fb/foothills_middle_school_wenatchee_washington.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd747dd5-9272-499c-8cc0-64ef363c7843/tonalagidisobukefepaxe.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_off00005c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5D 5688 bytes
SHA-256: 6f5ae619a9882849da2d3a144f93c3a3f4b5118bf24234a614831becbd9cc261
font_01_sfnt_off00006f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9D 10724 bytes
SHA-256: 90fc153b3e9a394eff26fb24e1b301210bb4918145b7d4476115290de81c8a63

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