Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d9c6f96195940c…

MALICIOUS

PDF

47.8 KB Created: 2020-10-30 20:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e72bb8d3f577e25591a47f2b3720bff8 SHA-1: 98dfbd35c2ee56ee841c4d72774edd37862990bc SHA-256: e8d9c6f96195940c934f3f37d800cfd668db819a6def4eb5c03f7eafb205c014
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and heuristics indicating it functions as a redirector and a link farm. It contains numerous embedded URLs, with a primary malicious redirector at 'https://ggtraff.ru/strik?keyword=tropical+rainforest+physical+landscape'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The presence of multiple external PDF links further supports the link farm classification.

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/strik?keyword=tropical+rainforest+physical+landscape In PDF document text
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/jivon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f948cf06f0f8.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/jumedemimo/konanu.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/fubilagivobunisax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e8f6d7-cbca-45fa-bfc0-fa776063406d/vudevupasukizejewas.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/74833396989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b9037e-4a61-4906-af7b-e0d117ff26af/36999037567.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/137962220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05de59e4-d4b3-4dd4-996c-9f683fedb007/90047016780.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_off0000788f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x788F 5296 bytes
SHA-256: c758924341c6a1d85e708ae0b60d4f8770c9aa446f14a8c407f59c9e4ef07b8b
font_01_sfnt_off00008a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A94 11252 bytes
SHA-256: cf64a5b81b9fb68a55e73ea3b150c50486317336a4fe063693ddb1e1dafa9b87

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