Malicious PDF — malware analysis report

Static analysis result for SHA-256 583d637c789bb680…

MALICIOUS

PDF

41.3 KB Created: 2020-10-08 14:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d902ebb9311bd5139fc225b17c334d3d SHA-1: 9b8ddfe6639debffa2269bebe7ea6e6e2bfb75cb SHA-256: 583d637c789bb6801e76c159713e42c9175cd4096466ad0518abaf7781471f86
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm designed to obscure the ultimate destination. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is intended to redirect users to 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://ttraff.link/pify?keyword=a1c+conversion+chart+pdf In PDF document text
    • http://files.cupe960.org/uploads/1/3/1/4/131406947/8139509.pdfIn PDF document text
    • http://files.hellobeautifulconroe.com/uploads/1/3/1/4/131453526/6054347.pdfIn PDF document text
    • http://wolozado.americanitaliancancer.org/uploads/1/3/0/7/130738799/doxilo.pdfIn PDF document text
    • http://finekar.queerlysober.com/uploads/1/3/1/1/131164293/a8b44cb338c9e78.pdfIn PDF document text
    • https://site-1038541.mozfiles.com/files/1038541/69188054253.pdfIn PDF document text
    • https://site-1038629.mozfiles.com/files/1038629/43314075700.pdfIn PDF document text
    • https://site-1037828.mozfiles.com/files/1037828/75535194766.pdfIn PDF document text
    • https://site-1039999.mozfiles.com/files/1039999/64466927691.pdfIn PDF document text
    • https://site-1038614.mozfiles.com/files/1038614/92843457634.pdfIn PDF document text
    • https://site-1039631.mozfiles.com/files/1039631/memujakorafugopilab.pdfIn PDF document text
    • https://site-1039506.mozfiles.com/files/1039506/nipotagiwabirilewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec2b564-5599-440c-a5ca-682e8417b400/votagegemure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901f5aeb-b47a-4e75-9a61-87e46e66471c/76252905390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d13cca-3c1c-46b3-93c3-7555f8ae160a/41135549359.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_off000063ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BA 5312 bytes
SHA-256: 329a67ca8bcfe65a4e060f51c664b8c281c9b1e6f507704eaea91be24b31a50e
font_01_sfnt_off000075d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D8 10268 bytes
SHA-256: ef30e0c93af868784eadd011fb6060d39266e9e6d11e176420ab33c5bf1d2a6f

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