Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaac50f8673b541…

MALICIOUS

PDF

44.3 KB Created: 2020-10-03 09:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 11b6893bfd53089609a2dee7bff5586e SHA-1: 7b62ad346b768faaa31ce80738cc20da49f272a1 SHA-256: dcaac50f8673b541e8f8e701b3060efb5586f2fb30c9c8adebab4c24ba6f7419
124 Risk Score

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 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=fleetwood+colchester+owners+manual In PDF document text
    • https://site-1036876.mozfiles.com/files/1036876/19791652277.pdfIn PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/dujefebidedumodiduzo.pdfIn PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/nanarusezewuvuper.pdfIn PDF document text
    • http://files.minnewaskawarmup.org/uploads/1/3/1/3/131380308/15ce91.pdfIn PDF document text
    • http://zudaxuxa.lecharmantarts.com/uploads/1/3/2/6/132682883/mugokusifuzonez.pdfIn PDF document text
    • http://nuboben.sailsea.org/uploads/1/3/1/8/131856713/modoxiki.pdfIn PDF document text
    • http://files.darkandfevereddreams.com/uploads/1/3/2/3/132303127/6753134.pdfIn PDF document text
    • http://xaxune.playistheway.ca/uploads/1/3/2/3/132303028/a4b2c6ed84.pdfIn PDF document text
    • http://files.kingdominnovation.com.au/uploads/1/3/1/3/131379248/7408477.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/jejug.pdfIn PDF document text
    • https://site-1040251.mozfiles.com/files/1040251/telenosexeditolug.pdfIn PDF document text
    • https://site-1038770.mozfiles.com/files/1038770/84329582197.pdfIn PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/jufoterawawibuso.pdfIn PDF document text
    • https://site-1037237.mozfiles.com/files/1037237/17120227648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCC 5224 bytes
SHA-256: b6cdc4ab23d15a72ff9530f4b228f0b2e3de9fed877f450cb646b3f248fbdf21
font_01_sfnt_off00008175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8175 10060 bytes
SHA-256: 168858e05735c6425fc17a05450658e888abfb4dfba3094ccd799235264728f1