Malicious PDF — malware analysis report

Static analysis result for SHA-256 661c94ac2fc0b169…

MALICIOUS

PDF

42.0 KB Created: 2020-10-28 04:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 66b6e385ea2ebaa331c2f1c3f4a5e0fd SHA-1: 008280f96f8783b6a37beb4e8f0ecdef4f10b855 SHA-256: 661c94ac2fc0b1691afc25a16df432def62ac822014bb0cb0ab36841bc81cfca
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is associated with malicious activity, and also hosts a large number of other PDF files, suggesting a link farm. The presence of a 'download button' heuristic and the document body referencing a search query for 'hack nba live mobile apk download' indicate a lure to download further content. No scripts were extracted, but the PDF structure and heuristics strongly suggest a malicious intent to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=hack+nba+live+mobile+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f9332e858bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f97c1d279592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f8d745e179c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f8c129eae467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f98c02cef410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f8b2e8fbf5ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f86f465952ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_5f977061dc115.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/junikuxadekojixojar.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/moxokisarev.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/janodojivi/wibaped.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/application_form_for_teaching_job.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/42719795352.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/spanner_manufacturing_process.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/dedonizedex.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/gegepipezovigozijedowimig.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_off00006388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6388 5264 bytes
SHA-256: ebda661251a953d57c4de3b81499cd4a77c20f1c9240bd8840fe505eae009a13
font_01_sfnt_off00007569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7569 11020 bytes
SHA-256: 6afa52e8c502485e5e002b2821d3de19e17de14afc4d64397fa7be7c7de5aab0

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