Malicious PDF — malware analysis report

Static analysis result for SHA-256 478f6c42f17eff5d…

MALICIOUS

PDF

75.2 KB Created: 2021-01-07 20:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d65fab0f7581d9dafc687aff8b7cfac6 SHA-1: 9f48af8b6453270b08f44e22a6f898591cda1be0 SHA-256: 478f6c42f17eff5d49af09da525ab6f91638f21ea95e602d3745207b0dbc7a78
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 large number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to redirect users to potentially malicious sites, likely for phishing or SEO spam. No scripts were extracted, but the presence of numerous external links suggests a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/aws?utm_term=canvas+proposta+de+valor+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fa9cf5781ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_5faa2fc285cf7.pdfIn PDF document text
    • https://turexebino.weebly.com/uploads/1/3/4/2/134265835/9aa223e0a4.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/8902270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f9121c4179e4.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/gexazinugegab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f9bd3f28e331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_5fc247af6bdf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5fcb7a4b58227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc8b2f36a73e.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/6f4f5831-d5f9-4032-b98f-7188ab1101ab/77416920777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34b40ec-8973-4c43-b6bc-4fe2a4e4aa9f/ciudad_letrada_concepto.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/tubopugimaruluxujasuvibas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4a7579-02c8-469f-8909-bc01c32d6e43/egyptian_wall_artwork.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 5068 bytes
SHA-256: d0e3492d34d3e781bc00743a23602a18175d34e452ecf41968e93fe2732bc219
font_01_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 11112 bytes
SHA-256: 2b010f571217aa5d26e350982721c4387061974a76879a92a8cd8160321d13f0
font_02_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 16080 bytes
SHA-256: 28d5afbff6c2e9e687c0d9657fc0c8653379f131105490b33dc0c12c71f72ad8

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