Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3a6760f247b708…

MALICIOUS

PDF

48.7 KB Created: 2020-11-01 09:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f743d14487e3d09b7973c09fc0892f97 SHA-1: a9b519e426b0d0aeb11e0fe9c2b7f512cdb90487 SHA-256: 2d3a6760f247b708a8a476e888c6cf89b9e14b2d75ae2f3774315eeec48d8239
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/pify?keyword=apush+chapter+13+quiz+answers In PDF document text
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/e5ff6.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/7552807.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/7216730.pdfIn PDF document text
    • https://tefidimigeb.weebly.com/uploads/1/3/4/3/134319466/xebozeza_gemakokibawirab_mifofumodi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vazisi/1st_grade_math_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2dcf026-c522-4c16-9332-e304c2e6fe69/fafomazigug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1739/4586/files/36716710049.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/78478948768.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8907/7448/files/dakine_split_roller_100l.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBC 5460 bytes
SHA-256: 01a72af7e879ef2a56848242433bb065e2beae12b63adcc390452de3333a84f3
font_01_sfnt_off00007f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F70 10096 bytes
SHA-256: 42cebbe6208e81648bab1f9d18e2070eddcf669c8d4e65020c3ee3554ff6a921
font_02_sfnt_off0000a1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1EB 16028 bytes
SHA-256: 0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8

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