Malicious PDF — malware analysis report

Static analysis result for SHA-256 842deaf27d98c85f…

MALICIOUS

PDF

41.3 KB Created: 2020-11-04 17:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e1e5a140f85eb44faba20dee5295083b SHA-1: 9d7679bce645815217ddc4108a1801eddc5dc321 SHA-256: 842deaf27d98c85f9f682354e360659ef6d60dd5ee431e31181ecdf78a955643
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=da+bomb+company In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5058540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_5f98769f21f48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_5f9e4145c3519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/pratidin_newspaper_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7424701-df47-41ea-9343-13d7526f03c4/87843184497.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/ruboz.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/50996301864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c83ca9-365d-478e-a38a-b590734a43a0/structure_et_transformation_de_la_matire.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/kibatawezukamijoxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d0554d-e42a-4db0-b936-c4d24d0c44a7/me3_aethon_cluster_scan_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0427c409-0179-448d-9da6-e6ed452f6e9b/22078907118.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/kewata.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000590f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x590F 4556 bytes
SHA-256: 7fad021871bfdf519b701acacd67d71aeb708122a9d6f1392f6214e65a94567d
font_01_sfnt_off0000685d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685D 10072 bytes
SHA-256: a76bb5413cd74e796d84d56176e49e1f93c399fb4296af1f97ce7e73d7fa9a51
font_02_sfnt_off00008adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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