Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2cfd8b855b444d…

MALICIOUS

PDF

38.7 KB Created: 2020-10-09 06:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0443ab064285671d264f4d0a7a9ddd96 SHA-1: 93088408bfb5459c2a6d36ff732dc13120e13a61 SHA-256: 7a2cfd8b855b444d67f4d5634320df8665e7f7162ae8fd1da44f490f4f6c9c59
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'macos catalina dynamic wallpaper' and numerous URLs, suggesting a phishing or scam lure. The ML classifier also strongly indicated maliciousness.

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=macos+catalina+dynamic+wallpaper In PDF document text
    • https://site-1042776.mozfiles.com/files/1042776/61545006488.pdfIn PDF document text
    • https://site-1042498.mozfiles.com/files/1042498/95247332679.pdfIn PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/988244758.pdfIn PDF document text
    • https://site-1038497.mozfiles.com/files/1038497/rivugolisedulif.pdfIn PDF document text
    • https://site-1037866.mozfiles.com/files/1037866/zubelevofirexaporonum.pdfIn PDF document text
    • https://site-1036731.mozfiles.com/files/1036731/81410111221.pdfIn PDF document text
    • https://site-1042627.mozfiles.com/files/1042627/logiligetoba.pdfIn PDF document text
    • https://site-1039719.mozfiles.com/files/1039719/rajurakuxikopoga.pdfIn PDF document text
    • https://site-1038803.mozfiles.com/files/1038803/ranezadakilitebuwufaf.pdfIn PDF document text
    • https://site-1039698.mozfiles.com/files/1039698/boberikuket.pdfIn PDF document text
    • http://files.brianscarpetcare.com/uploads/1/3/2/6/132682193/nokunub_dejafate_nediganotidizem_lafef.pdfIn PDF document text
    • http://files.gametimeranch.com/uploads/1/3/1/8/131871556/boxetugik.pdfIn PDF document text
    • http://files.janinegoldsworthy.com/uploads/1/3/1/3/131383444/resanemare.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_off00005902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5902 5420 bytes
SHA-256: c0d0bf8df78e13df2e14da1fa2645f740ae6f4f158d6a361d418677c4e518cbd
font_01_sfnt_off00006b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B77 10060 bytes
SHA-256: b6d4a03e2cecd58dabddb9371a0c88f1fc84e61f66f8c3e49d11fd1b0e988b8e

Open this report in the interactive analyzer, or submit your own file for analysis.