Malicious PDF — malware analysis report

Static analysis result for SHA-256 521dfba9634cf547…

MALICIOUS

PDF

42.2 KB Created: 2020-10-27 09:34:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b32b583d015448d524da4c10fa2af701 SHA-1: 39159c40330a831837ed12f33f0b879e0861a6b4 SHA-256: 521dfba9634cf54706ea79c83a9b992f9dd59f32a68f8e25ef0e575e5ad66cb1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body and embedded links also reveal a large number of external PDF links, many of which are likely part of an SEO link farm. The primary malicious URL identified is 'https://ttraff.com/123?keyword=kingroot+apk+for+samsung+j200g', which is used to lure users to potentially malicious content.

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://ttraff.com/123?keyword=kingroot+apk+for+samsung+j200g In PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/xexesenot.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/gojununuje-mufajotibu-vizigajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f914d469b550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5f8d1dc6bacf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f924fc0aa96c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f8a9ec1d7cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_5f8fb584c7b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f8aabdaa4ef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f9750e7544bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f8a5b885b694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8ed675b9ae8.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/a92830c7-135b-41a5-adf9-797e113a825b/91354416981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dde3d9b-58d8-4f9e-a89a-be1f1064221a/wupalowupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb935379-89cd-43d7-bd4c-85ae597bc84a/2008_toyota_rav4_repair_manual_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/algebraic_topology_a_first_course_greenberg.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/latest_sports_news_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/44214462928.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/boy_erased_livro_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/wheel_of_time_map.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/building_construction_award.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_off000063f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F7 5572 bytes
SHA-256: 277a598b58d4badda35786f6527a361df9ca473c271006b552fa16bdf1994eaf
font_01_sfnt_off000076d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D9 10740 bytes
SHA-256: 5269092174748b2c619386105dac47149dbe4704c3327c96b2b69f947f89cd07

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