Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ab9dd4368cec7e…

MALICIOUS

PDF

41.6 KB Created: 2020-11-06 11:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a4523db4dfd1a3d92c76957a282224ca SHA-1: 29e78bb9adfb251d59e65fb94e8c6e3f796479b7 SHA-256: d1ab9dd4368cec7e6dd10bf26e6550d15a7e3acf0a0f57c0e0441250cc74f3f0
124 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 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://traffmen.ru/strik?keyword=story+grammar+worksheet In PDF document text
    • https://nefenupenarus.weebly.com/uploads/1/3/4/4/134476068/01804ad51c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f9501d774057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fa4bbe11bef5.pdfIn PDF document text
    • https://gebaxugore.weebly.com/uploads/1/3/4/5/134594027/4017993.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8709547.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1995322.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/vanesasiwe.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/fewomo.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/pisukelufeda.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/vexeliku/remtech_expo_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/atp_adenosin_trifosfato.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/58840386283.pdfIn PDF document text
    • https://s3.amazonaws.com/kamigovitakiril/mowutabuvikuz.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_off0000624e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624E 5428 bytes
SHA-256: a834158b64a1a4935513301146092ecd4034b91932629f73f933d4513177ba9f
font_01_sfnt_off000074b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B4 11016 bytes
SHA-256: c915d4f151a27a365b29f673a25f74057a8c881b4abfea17e62b46e207fb4600

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