Malicious PDF — malware analysis report

Static analysis result for SHA-256 9761dcce877b2dac…

MALICIOUS

PDF

45.7 KB Created: 2020-10-04 08:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 03bb100f2c687f573ff9fa018ed91ff7 SHA-1: 669de9172697400cf1e0baa488c16c082dc6bee5 SHA-256: 9761dcce877b2dacdc7359f45a7c87e450f21ff15e9dfdf20d015532d0f2e0ca
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a 'Password-protected archive handoff' heuristic suggests the user is expected to download an archive and is provided with a password, a common tactic to bypass security scanners.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=el+pianista+descargar In PDF document text
    • http://xabob.antoniacundy.com/uploads/1/3/2/6/132695219/zemimonofeba.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/4da41581-f059-4d3e-9950-ef3fc884025f/kikafilabonijawajux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76355f61-6ad9-42b1-be7e-a2cb59ca7ab7/93920158867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1eaac1-feba-4b59-8c06-2bd806362bb7/xedatalebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc2b3e4-58dd-494e-9812-7a1a323ec0b2/daligidekerixotomolit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483f9165-e155-4102-9431-6aba9686d186/tidijomiruxisoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a928d8-cd1d-40ff-801b-bbea53f8b5fb/wozuzinunipovuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7849ad-5786-44f6-ac8f-201418dc9bed/fafajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7774a69-a13d-4532-b30a-f2d08d21b272/jokivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df1d671-bad0-4fa6-9477-7755acdddde4/66316387506.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_off000071ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71ED 5200 bytes
SHA-256: 5775e878ce5c408ec7bbb03491972c370438a130f40210df78a905ac5fdbb9d6
font_01_sfnt_off000083a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A8 11400 bytes
SHA-256: 6e0d6f1623e734b4ae0aa0a456eaec7ad96ccf8a11df2d06e585897954d33565

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