Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3cd4741090d7b9…

MALICIOUS

PDF

40.5 KB Created: 2020-11-05 13:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b62568065bc0326d05d41804b66953a8 SHA-1: ec23babfbfd3f31f31493fd1f9fafb2b37f7551e SHA-256: 6b3cd4741090d7b9f4d201364b1616be39b0a07e85c061ff11a3c0e0439b22b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though obfuscated, contains text and URLs that align with the heuristic findings of a link farm and potential redirection to malicious infrastructure.

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/strik?keyword=aba+examples+of+extinction In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427499/normal_5fa0def0ca556.pdfIn PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/tigimupugud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_5f9e3a5401e18.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • https://galafiki.weebly.com/uploads/1/3/4/3/134347291/5957294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f9f85eb58152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5f90784fce804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5f9e0726e5fa9.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/6281772.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/rixidifo-tevemef-pasejiwis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5f942455ee0c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5f95d911e9b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f9043b86a159.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/wixanarer/arthur_schopenhauer_carti.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/nerododabe.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_off00006180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6180 5260 bytes
SHA-256: 28a3459ca5cd5c770718f1ffc9f3b00db27c1320d353699e3558767a7dced069
font_01_sfnt_off0000735e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x735E 9880 bytes
SHA-256: b4afd02b44958ca494a8e6907d3e96c00b9c1d9d3841afcf8fb7dd15a158c713

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