Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3b61acca8edc12…

MALICIOUS

PDF

52.2 KB Created: 2020-10-26 17:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 91b7dcf1a6b0465b7b45d0d842e02a51 SHA-1: db34ae906001ef33aba66a6cbf36ad88599a5029 SHA-256: ca3b61acca8edc1221ed868b883d57f4d172b4f16a1502eb9dbfa5da1c9ba964
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=iphone+xs+user+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f8f9d83405e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_5f8d3d0678cb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/carysil_sink.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/business_process_modeling_simulation_and_design_laguna.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/nc_iii_bookkeeping_reviewer_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/80766207166.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/20_amino_acids_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2064/6048/files/microsoft_word_android_apk_old_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0507/8434/files/race_3_game_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/world_map_with_city_names.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/latex_include_animated_gif_in.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/30444561136.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/96614351275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf93621-13b1-4903-93e4-4c75dd055844/fogojoxanijafedunuvabime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848f5e30-d636-4241-b85b-bb3705162c0d/joxudibifuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/441b2ee5-b0b6-4f54-83b9-9c2200e10b2e/51026404234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5344d4-acb8-4b69-8ffb-60213cf990f1/loruxowejawowurejeked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa6d5c4-b73b-4846-9766-ee2b36f4ed52/46736318501.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6790 3280 bytes
SHA-256: 507059e1597b4f306cca34425a7847ab35df3dafacd5bf02cc209ea67f811fb8
font_01_sfnt_off00007358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7358 5068 bytes
SHA-256: 766d4abc1600c8a9c953551d0d2415e22fa578a9741b8cd0c049a871f8f89a21
font_02_sfnt_off00008490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8490 12852 bytes
SHA-256: a18e7dbac6c7f457ed7538791d6f015f30206682a8116d7466d1bfbd4f56967c
font_03_sfnt_off0000ad8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8B 16164 bytes
SHA-256: 5df48bde2036c06decda9959b3d6fb0a1077c3b021b9e08d6612d9aba1d41ee6

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