Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ef993cde2e973e…

MALICIOUS

PDF

42.9 KB Created: 2020-11-08 02:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a3de678a0a251bb8fd486d69d33f9b63 SHA-1: 259b7a68a9008fd060503dcb92e703eac9390f37 SHA-256: b5ef993cde2e973e815baf7da9deaa8145bb19d2e09e07d4f15ee1ca43dbf686
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to S3 buckets and are likely part of a link farm to improve search engine ranking for malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful sites. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/aws?keyword=fun+noodles+remix In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f873ea22f0f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_5fa3b89f3e7f3.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/laradusa/pokemon_rarity_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/trampoline_spring_cover_pad.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/defensa_siciliana.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/86493025904.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/segud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c850d0a-0295-49dc-a206-cdc466b07cb8/zuxokenumiwadeje.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/17171435407.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/software_architecture_in_practice_3rd_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/cancer_de_prostata_tratamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/simple_decision_tree_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/table_rock_lake_map.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/wizuz.pdfIn PDF document text
    • https://xivikutedito.files.wordpress.com/2020/11/zonapefaburi.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_off00006a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3D 4784 bytes
SHA-256: c1357df6ec2c0d04009b0cb1145600c745d4d5a6480a5b15e1702c2490cf036e
font_01_sfnt_off00007a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A70 10536 bytes
SHA-256: 7decff4cda0ca3f4e8853c5663ffcc3840d6ba039c7a8e1837f551a784c1b15b

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