Malicious PDF — malware analysis report

Static analysis result for SHA-256 6611dc0f2b34c1e3…

MALICIOUS

PDF

48.4 KB Created: 2020-11-02 19:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ff36063cb988738d1023cb67fbbb4551 SHA-1: d5c13459efa133f7950b25ac2df38578f4c80f41 SHA-256: 6611dc0f2b34c1e3fc627c6cbbcc49f1731a42f4fb11990b15101e7f7d4dbead
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/123?keyword=4th+grade+context+clues+worksheets+free In PDF document text
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/2383869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f921133bc553.pdfIn PDF document text
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/xinaxubut-lokiz-resebuwupuf-pivaxod.pdfIn PDF document text
    • https://jisasulozif.weebly.com/uploads/1/3/4/3/134371627/lokerozijesi_wuzegevuf_kezabinotovugof.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/78884e18-aad8-4e65-b8d6-b5f616ca2d2a/rezigunoguku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b38d113-bc3e-4bd8-b63f-da82cd9dec92/edge_pro_knife_sharpener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f159e93d-f18a-478d-bcde-63d7651584a4/gowazanef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6dd1738-e023-4edc-9d44-d5f7ac0deb7c/81701236012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5f4a96-a431-4324-9b10-cee5040befe9/838629230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8460/2262/files/logiwipajosulike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349961d8-d532-4db0-9592-46c1aed6964c/golden_retriever_puppies_maryland_rescue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58775b73-bdac-43d5-9bf1-ac4e43c51f05/libigalesojilibujuvulutel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ab75c6-b5d3-4b87-a0ba-11759017bc7c/40718085930.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_off00006929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6929 5500 bytes
SHA-256: 267ddd1306ac960d21d818ab76ef1ced37a242bb152cbdfe701ab6b038d2e8da
font_01_sfnt_off00007bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF8 10344 bytes
SHA-256: 4e67966a59cae5adaa2063c8c9de88422331c65ca0623db1f36f770ff54d4f0b
font_02_sfnt_off00009f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F83 16060 bytes
SHA-256: 3a2bb6651a5ad642813d1e324805fe83a688734d44fd23e014c0665a2602df32

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