Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66f6f2b8fd5fea0…

MALICIOUS

PDF

52.5 KB Created: 2020-10-23 17:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6c3aa3803877c7e7ac70e6dcc91135b0 SHA-1: cd06fd91064d3f8acc77e8043ae91a8bb0c668a8 SHA-256: b66f6f2b8fd5fea0b77e5b20913634b45e0cea2fa19461add144e3128c6bc874
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL suggests a potential distribution vector for further malicious content. No scripts were extracted, but the primary function appears to be redirecting users to potentially harmful external resources.

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.link/aws?keyword=autosar+tutorial+pdf In PDF document text
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/gomesepopudikapesozi.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/4e7a50787f.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/3993147.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/287384.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/7092564.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/6182291.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/lixiwijepavo.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/f8ff2bf78c8.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/3970791.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/8fd76c.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/0b11c64d-cf16-41b4-bc55-cbd9635817c7/jaxijirujidaduleb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ea3a56-712b-4e68-a0b1-3ec70cf4470e/12031027654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772e31b2-2fa0-4541-a2aa-c2395da3a6eb/lurevafubup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f4f448-51a8-43c3-85a5-4b0b8d82649f/xofonotukelozozofuguka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df808348-d91a-4a50-ac3c-3021670995ba/456038682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae554cd2-3128-4e0b-bc30-f62ea5103908/vavikitupat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781cb1b1-472c-4d8b-8fda-2893c40d4a8f/19332836107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2ead19-a2f6-4be7-8ad0-1fcbda3791a3/sasalitimusarisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b84d5ec-dc97-4fe5-928a-fdb209899d06/kopapirewejabuvawedog.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_off00008c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C49 5024 bytes
SHA-256: 477724df0aba0d794a2a78b0a2d081f02ae4cc0a567910cb89f4b048dbff3fdf
font_01_sfnt_off00009d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6E 12288 bytes
SHA-256: f92095a5ade2e0c9eeb6064ebde2f44d41c39dc7c56ed7833bddd08868989181