Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ee7a4d94726451…

MALICIOUS

PDF

51.2 KB Created: 2020-11-06 01:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5a8c243152f8cb8689dbee852d0eae5c SHA-1: 8a00174b1bfbce52d93990bb4049c6adaacdcd2f SHA-256: b1ee7a4d94726451eb227f216acbf289903e1d714b4bc00698c17b876988fc93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirector strategy. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The document body, though partially corrupted, contains the phrase "Sopa de letras en espanol juegos" and the malicious URL, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffking.ru/123?keyword=sopa+de+letras+en+espanol+juegos In PDF document text
    • https://nimitokusewifoj.weebly.com/uploads/1/3/4/6/134647116/2604467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5fa05cc97aa39.pdfIn PDF document text
    • https://danenogamapan.weebly.com/uploads/1/3/4/4/134481258/8680257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5fa309c435299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_5f8d44b98352e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_5fa4884093506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5f94faa327456.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/jeromopelurab/fizelinelenebatejof.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/xudiras.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/pearson_florida_geometry_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42bc98a-0cc0-4fd3-a3ce-aede113dd9e4/52089536355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0652/4583/files/crackerbarrel-survey.com_official_website.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/design_code_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/92993890815.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/icontrol_1000_camera_software.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5852/6869/files/house_escher_40k.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58E3 5140 bytes
SHA-256: 288edad9c34d0ec39375b9d69b041fd8ff82c0ee095072ce2ccc6b5ecd32fe3b
font_01_sfnt_off00006a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A64 2284 bytes
SHA-256: d64340b15287c056ecc73f7633c35ed589b75f78d9041c43f06e2711d127cdd4
font_02_sfnt_off000074a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A3 11564 bytes
SHA-256: cc21509eefba70169789f5174f60fa76ce8dbff729d7f1f4eb0a2f43d6e942c3
font_03_sfnt_off00009a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A23 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_04_sfnt_off0000aeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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