Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c16dcf037138539…

MALICIOUS

PDF

43.0 KB Created: 2020-08-14 08:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 668e5c31cb1b15c60bf4f41339ba8675 SHA-1: ff2b680b101becd73832a2069d54c58565958491 SHA-256: 5c16dcf0371385391ce5bd7b7ef1c2bfc0dca1481fddac285c9ed2af76f0282d
162 Risk Score

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 a URL related to 'circuit court of cook county online forms'. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, many hosted on Shopify. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence suggest a phishing or redirection attempt, likely intended to deliver a secondary payload or lead the user to a credential harvesting page.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=circuit+court+of+cook+county+online+forms
    • http://files.avmheartlandchapter.com/uploads/1/3/1/4/131407406/9978969.pdf
    • http://mepata.landmarkpublicart.com/uploads/1/3/2/6/132681352/87f2d615eb12eb.pdf
    • http://files.levinedesignstudio.com/uploads/1/3/2/8/132814250/8e89a60375c8850.pdf
    • http://gogipubig.wayashealingpath.com/uploads/1/3/1/4/131407406/9682808.pdf
    • http://files.ressource-therapie.com/uploads/1/3/0/8/130873918/5025190.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/ti_83_plus_manual.pdf
    • https://cdn.shopify.com/s/files/1/0448/1505/7062/files/breathing_apparatus_set.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/36588475872.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/manejo_de_base_de_datos_en_excel.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/magurube.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/75084735651.pdf
    • https://cdn.shopify.com/s/files/1/0431/6872/7194/files/advanced_excel_formulas_with_examples_in_excel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3166/files/nezitebarogidil.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/gujopok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/rotevutolonisoke.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/riselozedineme.pdf
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/pernkopf_topographic_anatomy_of_man_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7790/files/elastic_and_inelastic_collisions_problems.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/79969839108.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c47.bin
628fff817bd4b53e9b818c55b8f1eef15fb8c8cf19e8bc7b0c4b8e450183aa0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C47 4888 bytes
font_01_sfnt_off00006cd8.bin
a7b20c60f2edbcd2131ebd7d171c492a10c0434634fc9e2db1c05678fdde8640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD8 10292 bytes
font_02_sfnt_off0000901a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x901A 4324 bytes

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