Malicious PDF — malware analysis report

Static analysis result for SHA-256 da59e14af5f8bbc5…

MALICIOUS

PDF

99.9 KB Created: 2020-11-04 15:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1cd5ad4dbe9b772610880ae48e253e9f SHA-1: 6563a0e40ad0cf8026593955693b7733510faab8 SHA-256: da59e14af5f8bbc567873ec7e9d5f6f3bec2d5dd704dd2012c2e62f09dc2979b
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://cctraff.ru/aws?keyword=mark+twain+books In PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/2c6ba1.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kojurufilufopimob.pdfIn PDF document text
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/2125776.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/52aa5dab-6f13-41b2-a3b7-982413361968/wukumefifenuzuduzus.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/blacksmith_lab_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/47397569548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c84e69d-279e-4fb2-882e-7ad6195736b0/words_with_denote.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/gigonejanevuxipuvubuwewof.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/brand_awareness_research_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/vimeragikenitut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e94cdd-ffef-494a-87ad-65546cee7e98/81485823544.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00015151.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15151 28200 bytes
SHA-256: 43636eaeecd9be8d8b078f5b09d32b15f9dda492becd82239e733474243a7c4d
font_00_sfnt_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 4948 bytes
SHA-256: 3aa5fb30d25cc7ef2368eb50d3be27ff282b002efbddfcbe16b22e28cdf7eb64
font_01_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 2236 bytes
SHA-256: 337d6416420a05dbdd303242054fb0b81607403aa080aa24d751cc4156ccb357
font_02_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 12224 bytes
SHA-256: 0b058e8e6778a1d07065c619d959a75a2dd4de0c3b65344cf74a673bccf16020

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