Malicious PDF — malware analysis report

Static analysis result for SHA-256 39658e04747b574d…

MALICIOUS

PDF

41.6 KB Created: 2020-10-25 23:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d668843a6d074bd34220691881f41fa3 SHA-1: e8be4c432acda5b378ab643caa0a273db7d7040f SHA-256: 39658e04747b574df4f01acd1087f042e6761d79e3583b4ab6b1a5737002f5f2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm, suggesting an attempt to drive traffic to potentially malicious 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/strik?keyword=imaginarium+train+table+instruction+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f87351191f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f8d6e0b33741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f88b84e17acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f8e34c1b230f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f89fc296b7f0.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/girozamesolu.pdfIn PDF document text
    • https://fumubesoxumus.weebly.com/uploads/1/3/4/4/134485348/ripinubebupumamuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5f8db68aab540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5f91e58128633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5f90911d8af94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f875d79c0c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f8cb34d80724.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/459cb617-47d0-49ca-ad94-8e0758344188/nejajepejeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73f5002-a941-4741-83cf-0cd722483bd5/68728692959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab29a3d0-4ec8-488c-bb06-6676df784766/nusogadet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112987a5-5636-4814-b5dd-13c87566c893/73213239269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b5ccb2-bea8-4630-8727-516e8833eee0/27166570144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554bbe71-fc86-4a18-bc4f-80d6b052b759/85783307572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f0d641-9191-4d39-8191-55028d808d5f/ejemplos_de_instructivos_para_armar_juguetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48568468-f6e6-46a2-b06a-60aa94d4d061/95263057329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3c1e2a-69a8-4949-8d87-fe089f444667/53624503747.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/94706053764.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/xusonigupegunoki.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/catering_business_project_report.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_off00005e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8A 5196 bytes
SHA-256: ee0a2e52800a32615818a65c6c706b771d220742fd4b24b10863ac634eb046f3
font_01_sfnt_off00007014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7014 11724 bytes
SHA-256: 294400908b898663cdbca79a3620f92bd158452f88916c33ccaa0484c7ea0a9f

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