Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca39b02bbc17489f…

MALICIOUS

PDF

44.3 KB Created: 2020-10-16 03:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 047f016a88c336c91775f8d84ebdeab4 SHA-1: ad6056a62f12d5ceda067abedf27f3d90bbbc855 SHA-256: ca39b02bbc17489f6d7c039631129138ea16bc18a608ac9882c9071419631433
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, suggesting an attempt to lead the user to malicious content or phishing pages. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, many of which are likely part of a link farm to manipulate search engine results, further supporting a malicious intent. 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.
  • 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://ggtraff.ru/pify?keyword=new+orleans+french+quarter+dining+guide In PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/615bfaa9afa8c.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/foburadip.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/pigora.pdfIn PDF document text
    • https://site-1042658.mozfiles.com/files/1042658/vitivinawaviwuzisetek.pdfIn PDF document text
    • https://site-1039950.mozfiles.com/files/1039950/gafukon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f87132cab59d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f8802c1e0dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f88c4bc5660e.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/aa9c9fb1-c345-470b-a59a-d77b3a582e2e/98857633321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595db39f-e15e-4498-ab5c-877d6c43b769/sawozanabizolun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72ae224-a963-4c7d-8713-68c79616728b/folawurowivotexat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7909b8-cbf2-4667-8924-cc6ae118b5d2/88105404238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7de1d3a-db8a-41e8-b837-0872aef2fb83/pinal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83063dd2-31b7-4b5b-8fd4-004a32dd3086/pezibesoxenidixib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca884d6f-8a5a-4d88-994a-d1281ad189b8/97092547567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877aacad-8f78-45c7-bffd-c24b983cfce7/vatar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5801b27-d47e-4237-be8e-0e1b831d119b/74627806659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10166cf0-3fe7-4d87-858b-3c4491491554/vekiz.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_off00006cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDD 5468 bytes
SHA-256: 72f672566aef7d312cfd250cc5aa240c64a4f61cf21b15aafad73335d2fe1792
font_01_sfnt_off00007f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7C 10592 bytes
SHA-256: ed246bb45a36124d58dcd77064b51240a8c64af54f0b108e2ad6cc8582c49011

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