Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b01afe6487889c6…

MALICIOUS

PDF

34.0 KB Created: 2020-11-01 17:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 533c2e83a8597bd9930544e2167bc8aa SHA-1: 00d6547fbe3b49f6002f207e6ba888b46d89a73f SHA-256: 2b01afe6487889c60eced26a8d60e4e62a0ba49d73a38f249eef8bed03a4789c
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious redirection chain. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm designed to funnel users to potentially harmful sites.

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 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.
  • 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://cctraff.ru/pify?keyword=wings+mod+minecraft+1.8.9 In PDF document text
    • https://netewubo.weebly.com/uploads/1/3/4/3/134325031/lalelaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f995e20c54ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f912a5373312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5f99a2ad568a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_5f9d2a0420c9a.pdfIn PDF document text
    • https://fovejurifeke.weebly.com/uploads/1/3/4/3/134342496/rozopexekole.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/kizepodujuxejinisasa.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/xiniguvukivixa-zotupaz-jawavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f9bb05aa62a3.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/5011088.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/tapategajevawopaji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0201/7976/files/lifetime_learning_credit_form_8863_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/netobojegut.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/69556943267.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_off00004501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4501 5756 bytes
SHA-256: 86c814914a4bc218720c41196b51b0a9a556f0adb060b8781125e0f9ed5d14e1
font_01_sfnt_off0000589a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x589A 10264 bytes
SHA-256: 877f984ff7b608e6629734c3b4487435d52c448f55a76cd12fcebc562e0475ca

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