Malicious PDF — malware analysis report

Static analysis result for SHA-256 121c8d6c62592040…

MALICIOUS

PDF

43.8 KB Created: 2020-11-04 17:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3015ec428c9fca1429a526c668db72be SHA-1: cac15ee7a259fe616773de6f1634c14b2c5a8f19 SHA-256: 121c8d6c62592040a233e6da49d5f13de3af9df66b4755d20d6d64e518a31128
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external websites, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'graphic organizer templates' and includes URLs that appear to be part of a link farm designed to manipulate search engine results. The presence of a malicious redirector URL and the sheer volume of links suggest an attempt to drive traffic to potentially 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 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://ggtraff.ru/123?keyword=graphic+organizer+templates+for+free In PDF document text
    • https://wiliwakura.weebly.com/uploads/1/3/4/5/134596421/mijixijepozov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5fa1d64c8dc03.pdfIn PDF document text
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/xamogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5f94766bedd81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f92a5b6dc8d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f975598151f3.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/5100978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5f9edb4259e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_5fa031643a926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_5f97cff10c386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuxadol/madijimidiradesoxegoxak.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/autismo_tipos_y_grados.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/34887784547.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/adding_company_outlook_email_to_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/role_of_chairperson_in_a_meeting.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1A 5296 bytes
SHA-256: 56382e60c8bdaa573f439029e7f8ab13d413c63e2b5a4871aaf6e9c1917392e2
font_01_sfnt_off000070f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F5 10256 bytes
SHA-256: 48353333bbb1c09b06d285f69d27289f658f54932b299d96b35f02b61958c389
font_02_sfnt_off00009401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9401 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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