Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cdb89014fd8b20…

MALICIOUS

PDF

43.1 KB Created: 2020-11-06 02:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 286025b16b85cd45bcd26255845f4c47 SHA-1: d8c951eb41517e1a7159d0e8cdf9f8132be0a766 SHA-256: 89cdb89014fd8b20585de903521f37bf5e52c91b91ed20c1df8e0dc2dba26f1d
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a link farm. The primary malicious URL identified is 'https://trafftec.ru/aws?keyword=stars+align+anime+canceled', which is likely used to redirect users to malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/aws?keyword=stars+align+anime+canceled PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5fa152dd6c543.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/vemokafomu.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/gixajure-gobotu-vipalakimopugez.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/kigavanus/three_ways_to_read_a_book_anchor_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/lopimevinog.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/36661537419.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5027/7783/files/futitiduma.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/dragon_city_hack_no_human_verification_2018.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_off00006a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A04 5364 bytes
SHA-256: 4b8f9af0877effcbea78a51cbd584ef9fbc92dcfb4d0e28cf06cdb2c78e20744
font_01_sfnt_off00007c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C24 10496 bytes
SHA-256: 35f010ee40c5a658ee689d449efcec175a68fe8d574917b18fa2930b5de3e08c

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