Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4826f2e732361fd…

MALICIOUS

PDF

62.6 KB Created: 2021-01-06 03:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 67c9085c406f2c3c62614378ab0eb749 SHA-1: 0a209d252599ac0d36c9395c82e57f22db49300c SHA-256: b4826f2e732361fdcdff3fbf72264e2dc763ce4c1e202c2b9671a6f64a1301ea
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Grace and Frankie' to entice users to click on these links. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/aws?utm_term=grace+and+frankie+imdb+episode+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5fcf4b3131ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_5fb9e6ef9f16f.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/heiDIgg/dark_knight_rises_villain.pdfIn PDF document text
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/puxelitetibozu_runerirubi_bediwusuvop_modere.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/pekuvaje.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/12a5d1ac-af75-4add-b379-ec3b04f03d04/organic_chemistry_brown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905000b0-cbf2-4585-ba43-77c0a27ca158/white_plastic_guide_rails_for_17mm_21_32_grooved_drawers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6693da32-75df-459e-a40c-9b3d4fdc1c07/35690966883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01a474e-9ffd-48d3-8c9d-712b09fca167/64528384898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1528f0-cd52-4bfe-8d15-ce58ff7b9fb1/dibolinidobimimojojabub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89033edc-4ce9-42a7-8983-6e9c5330deb9/xujimimifotagereteweget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755f8c21-4d0f-49d1-8d57-f46545d1a33a/bepokilerekokorukarima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d93f86f-430a-4fb9-9cca-4ce50d4ebfc8/two_way_frequency_table_practice_worksheets.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_off0000b4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F0 5676 bytes
SHA-256: e25890de3f5524fa160102998da522c77bcc03318cad6a322138959fbe7f65df
font_01_sfnt_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 10496 bytes
SHA-256: d0a70bc98f24ae87c7cad467693fccf30ffe639022d8e9852b771a5a0ce86c42

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