Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba904da3dab2b3f…

MALICIOUS

PDF

78.8 KB Created: 2021-01-11 12:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 071e78305f25a3cd2462e4e5e0b28bbc SHA-1: 53017b516c0d05b28410f8f254635700986497f6 SHA-256: bba904da3dab2b3f62580e708f9d668f99e989063056ec5cc6345e260876cd75
96 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its function as a link farm, directing users to numerous external websites. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of external links, suggesting an attempt to manipulate search engine results or drive traffic to potentially malicious sites. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?utm_term=app+games++google+play PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5faf78cac26ff.pdfIn PDF document text
    • https://site-1175108.mozfiles.com/files/1175108/como_sera_el_pase_elite_de_noviembre_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5f99a4e9e3a9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5feee3e651afc.pdfIn PDF document text
    • https://pinabufibofux.weebly.com/uploads/1/3/2/6/132682338/towozuvevegowijun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fef5425e0cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5f934c982183b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5fa60e43c3996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5feeb5d0524c5.pdfIn PDF document text
    • https://site-1176273.mozfiles.com/files/1176273/snake_in_the_grass_song_little_prince.pdfIn PDF document text
    • https://site-1177829.mozfiles.com/files/1177829/vevenusoxorulobobak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f8a30c62d305.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/8031279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 5132 bytes
SHA-256: 3b50dfc12f5122b9d9bd2fc2eb08f8128dbd1c7e431f1687d8df04e019edaa7a
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 10412 bytes
SHA-256: d8e4bcccac438e76b0d90593eb3dc947bb9eea599a5548623c92e3a34264bab6

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