Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6c7d5ec3a5cc4e…

MALICIOUS

PDF

39.4 KB Created: 2020-10-31 16:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d00d437b59cb5579dc164bcf2b0afbc2 SHA-1: 9a429ed878054a6152adf10d4f0f244423f63dca SHA-256: ce6c7d5ec3a5cc4eca8e96050ed9a58761cbefccdc26f13af8ad8697458e8a65
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to various external PDF files hosted on disposable domains, a technique often used for SEO manipulation or to distribute malware. One of the embedded URLs, 'https://ttraff.cc/123?keyword=john+deere+mt+sterling+ky', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.cc/123?keyword=john+deere+mt+sterling+ky In PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/gifisidozo_kazatu_zanuzexexafoloj.pdfIn PDF document text
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/6499367.pdfIn PDF document text
    • https://seboneluwisog.weebly.com/uploads/1/3/4/3/134368334/sutebopebu.pdfIn PDF document text
    • https://renefifukidib.weebly.com/uploads/1/3/4/3/134343870/wogobobosozaba.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/8add140d6.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2936/4387/files/nissitissit_middle_school_hours.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8194/8066/files/napkin_ring_sign_radiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423efb7d-58ce-44d6-9d1d-bca8665c2723/volasegejivokip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03a834c-0cc7-45df-9c52-78c9983d8e8d/jijuwumosesajazavefonijow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94418a8a-0123-4dd2-8d3b-45f0856e08a3/67531240934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29691cbf-1943-4faf-ade1-3b8f01b5f89c/88811679779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9689/9745/files/nutrio_animal_de_ruminantes_e_monogstricos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b62ece8-4401-4933-817d-8a11cb0dccf6/mebofevowupereve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4564/2663/files/outside_the_wire_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2098/2693/files/kixiwanunemunir.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000580e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x580E 5184 bytes
SHA-256: 675d85545d3c3400f32b4a1b6b774d751a6c4b9d5d6fa78fbdc514776da39813
font_01_sfnt_off0000698e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x698E 12140 bytes
SHA-256: a387f25310d0f17cd7abb00893e7e0d1ea822237f0f551c770885f6fb1a7560f

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