Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8f2433e9e67186…

MALICIOUS

PDF

44.4 KB Created: 2020-10-10 09:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 99e4e91578ad8527803ebc1ba971aacf SHA-1: 3491149f7f8093e422c1007dfaf4384953cd1796 SHA-256: 4f8f2433e9e67186f96417616d12d4b6c9af45e04b96eb4fd8bd951f36eebb54
184 Risk Score

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://cctraff.ru/strik?keyword=word+power+made+easy+by+norman+lewis+pdf+book+download In PDF document text
    • https://site-1044162.mozfiles.com/files/1044162/vedebajuv.pdfIn PDF document text
    • https://site-1040263.mozfiles.com/files/1040263/34984470304.pdfIn PDF document text
    • https://site-1042018.mozfiles.com/files/1042018/vosomirivagumidefigi.pdfIn PDF document text
    • https://site-1038629.mozfiles.com/files/1038629/sumasiruwemonufuvuvivesu.pdfIn PDF document text
    • http://files.bestwordsediting.com/uploads/1/3/1/4/131454482/9693477.pdfIn PDF document text
    • http://xudoxave.ihmconferencecenter.com/uploads/1/3/1/1/131163930/2746820.pdfIn PDF document text
    • http://warebojuf.innerhavendecorating.com/uploads/1/3/2/6/132681352/fe5ab30a15f.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/162fdbef-c9b9-4f20-85a4-cf3392dbd0a1/mokuxare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de109951-0414-4f61-9a4d-9ff04654d360/56226391437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be819181-5be6-482b-8d3e-6ddfa1722e37/41121482528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a626b8-6d7f-4950-b905-3f45496fdcbf/93991904931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4a4c9b-ecc0-41f3-8c02-ee6c8aec43f5/31279877173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d00de4-309b-418e-8df0-43d2b1378281/vagawun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57DA 5600 bytes
SHA-256: bbcf8dcd87a68ebe2c33f4e30febb50823a890c0834ae17fa6f19bdfed50fac9
font_01_sfnt_off00006adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADF 2116 bytes
SHA-256: 89454d8ece1be00d2333aac76955f46ed17c4d141322e635bf27f42efb43e54e
font_02_sfnt_off000074ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74AB 14640 bytes
SHA-256: ad8d924ae98a56be74490fa7dc9387d4c1879fe808f180df87e7ebade19872a9