Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5148a3377a4732…

MALICIOUS

PDF

40.1 KB Created: 2020-11-05 00:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 96bedfeb57d6d200de91d0baf2633874 SHA-1: ee5386e9a288e15a85effcdd2264fb55a346b754 SHA-256: 1e5148a3377a47323639937f504a71a8042b54534617b868ec76730a717645d3
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to benign resources, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains references to 'Roller coaster tycoon classic apk mod' and the malicious URL, suggesting a lure for potentially unwanted or malicious software. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to harmful content.

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=roller+coaster+tycoon+classic+apk+mod In PDF document text
    • https://zodovamerevi.weebly.com/uploads/1/3/4/3/134316438/fosokido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5fa200f3414b9.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/rovikibixu/human_resource_management_17th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/carbylamine_reaction.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/74748101228.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/zotorutu.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/31601077548.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/change_management_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/69886538507.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/ripofagodevav.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_off00005b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B37 5392 bytes
SHA-256: 050d89212301914d6c99889017be00ecce4377e52e3439afc82cd12e290248e6
font_01_sfnt_off00006d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D86 11272 bytes
SHA-256: 29d183b14189542c7f5c3a250f9c3caefd0f85c7e57908f08a634dda05aa5e5c

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