Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6cececc71d4902…

MALICIOUS

PDF

46.9 KB Created: 2020-11-07 15:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 64e9501951a023da2c8cd575f37b7647 SHA-1: d8c8a2e09633b8fc17adc75b02aaae36911fa78d SHA-256: ca6cececc71d4902fa806f16faa8873c0f17e08a5518b6fe6308ce4e1087529f
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains a large number of embedded external links, with 28 distinct links identified across 9 different hosts. The primary URL, https://traffset.ru/123?keyword=owners+manual+for+dji+spark, suggests a keyword-stuffed lure. The heuristic PDF_SEO_LINK_FARM indicates this is likely a link farm designed to manipulate search engine results or distribute malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffset.ru/123?keyword=owners+manual+for+dji+spark PDF link annotation
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/4064339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f8871e7dcbd5.pdfIn PDF document text
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/a80a8ac740bf37.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/tilexafapi_disew_mopegado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5f8b27617465c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_5fa5b3391ad6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5f9520e2db5c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f892818c1589.pdfIn PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/kolijiw_ragasug_didugodivobusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f97feaaa8b4b.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/pezeferoxesizo.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/suwuferubiv-vudubibada-xizijifadarezo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b457f7c-f7ae-4b02-82fe-dd991ac1c288/vufoxar.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/adjective_and_adverb_worksheets_for_high_school.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_off000074de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74DE 5444 bytes
SHA-256: d55436e259c79a925d7e910619728ef96b98e70955c969fa8a5990832ea2c47d
font_01_sfnt_off00008763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8763 11888 bytes
SHA-256: 632e11bfce2e5cd7d8fa52b142e167a30308554259aebcca2faf51591a58d9f2

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