Malicious PDF — malware analysis report

Static analysis result for SHA-256 4facf5c862dd022e…

MALICIOUS

PDF

58.4 KB Created: 2020-10-28 12:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 712903dfaeaa073c8d55f32092feae6d SHA-1: 4c06daf444e2762a2c2a9f51e317d23fc86967a7 SHA-256: 4facf5c862dd022ec3419c7a6ba3d3235d405b4d5d9d3f499cf59ddec145b170
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to direct users to potentially harmful content. The presence of a link farm further supports the malicious intent.

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.me/123?keyword=john+tracy+clinic+audiology In PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5f908a79c70b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f8aa8b6ced7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f92b3520ba4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_5f918361302f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f920d4d5f16a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f8cbea48753e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_5f8e26d46f636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f924b179c6fc.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/sazixipame/plato_the_apology_of_socrates.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/mirilu.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/21694798029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02e6200-143f-48a5-b388-f4caf829c2ed/94959909627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5c0da4a-7045-455d-ad4c-047afd21f80f/kerigukewupusowi.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/blanching_of_food.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/57404619925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45c3215-a235-4dda-b09a-5d6f0f67b845/undisputed_4_full_movie_in_hindi_dub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2275/1643/files/kentucky_drivers_manual_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72598872-49ba-4ff6-a43d-23e1266fda35/kigiburut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a131a0f-6f68-4bdc-83a9-50ba511c7a98/70558547881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2812/3295/files/spinal_anesthesia_anatomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67bb6e66-8993-4851-9fcc-c33bd65989c4/gafutufir.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_off00009978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9978 4880 bytes
SHA-256: d097862c6f3ee6b7955172f0709b9ffb6b577555ea3e2876595275ad2199b06f
font_01_sfnt_off0000a9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F6 10628 bytes
SHA-256: 75e44019a671318e21a243856fe069b9e03e7e2e4659e18e98591b7de99a2a8c
font_02_sfnt_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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