Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bc8273946f9a8b…

MALICIOUS

PDF

44.9 KB Created: 2020-11-05 06:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5f409082b6477f78310c20656ec0cbbb SHA-1: 172e89c94196474a552a96c753cc3621feed1e88 SHA-256: b2bc8273946f9a8b1e03f48e6db6d35182bdf6ef93c6ec54d3e68a49371a7b24
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://ttraff.club/123?keyword=emily+grace+hime+model In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_5f9666527d7c8.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/gumagabu/collecting_like_terms_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db09864d-66d5-467c-b007-aced693d0f1c/19976336897.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/59590347966.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/kinova.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/17977716108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0ced26-e379-450b-b1bf-0ad9d2fb1078/16605149509.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/98734364236.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0652/8152/files/vavorugawesiwaruxatut.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/99567840811.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/bacterial_identification_lab_worksheet_key.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_off0000563c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x563C 5232 bytes
SHA-256: 602c9c63890f5d47583b7cda2b42a6db33dc2c103e55e1584fd28a5182e7f769
font_01_sfnt_off000067e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E7 10052 bytes
SHA-256: 627a2f34b8c8a970fe062a071c8622f5926f3e25f6a82061b41d047c51c9570e
font_02_sfnt_off00008a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A45 18172 bytes
SHA-256: 42e697ee9e55c69276c71e7abcc94980c9789cb6985ccd7f38a8e50d124c3c34

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