Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d4b46ed558e753…

MALICIOUS

PDF

36.6 KB Created: 2020-11-04 15:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a0f1b35c70df517c85b98c662006c3ea SHA-1: d9ada53ce03438395cc0315e4e5b857056b7c533 SHA-256: 71d4b46ed558e75335817c8a74ecf71d187875387bfae5b8c4c53c53ed4b5d4c
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document contains a high number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document also contains an instruction to disable security software, which is a strong indicator of malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/strik?keyword=yoink+executor+key+system In PDF document text
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/1841000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f979fcb5c779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_5fa25482cb616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f961163e903d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8e5d36cae1d.pdfIn PDF document text
    • https://bafafodalub.weebly.com/uploads/1/3/4/3/134367540/e09fd390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413239/normal_5f98205193d23.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/4394570.pdfIn PDF document text
    • https://tonulolini.weebly.com/uploads/1/3/4/3/134341491/mevak-latob.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/4055002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5f9dee1315273.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/kavitokolezub/ssc_stenographer_paper_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73add7a-417d-4f1e-9693-c90be9d259f8/tefivigiwonezeboj.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_off000050b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B2 4896 bytes
SHA-256: d0b4838c13abdf720ccca046811b8224920bcee097a57f95d18b39b454e65add
font_01_sfnt_off0000615a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x615A 10696 bytes
SHA-256: 25d6bd86db7f5945344f3e8e92b93687d15af989502672ad08fce8716fc5cbb4

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