Malicious PDF — malware analysis report

Static analysis result for SHA-256 90420c229c6ea2d1…

MALICIOUS

PDF

79.0 KB Created: 2020-11-08 02:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1eff0cb314517cabf7221b74077e2edb SHA-1: d37bbc3d5c423e0b306ab177e4d99489b9b0cb03 SHA-256: 90420c229c6ea2d13ff6f582cd88920004333fd0d0da36a10446c60be458786b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafftec.ru/123?keyword=dyson+repair+manual+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f9247bc7b247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f8f2c9261bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fa72b8bb008e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5fa2164db14e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_5f9c611d58d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5f96d1a80c749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5f951745a7622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5f88ceb8cd2ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8710c21be4e.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/tibitexil/avalon_hill_kingmaker_rules.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/71688512578.pdfIn PDF document text
    • https://vutogozelid253333563.files.wordpress.com/2020/11/mudefapitidovovuru.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/hindi_numbers_1-_100_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/kanedulis.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/head_bumps_from_cats.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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 5100 bytes
SHA-256: 70cc6cd1d2647fed77b7f03e6adbfbba7d3a47c426aea4df381957afca162553
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 12304 bytes
SHA-256: 5177d258cc1c0bcbd6b6335e9856a5981a8adac7ef8de5305e0c74353ea4fb28
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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