Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5aaabe0615851e4…

MALICIOUS

PDF

43.3 KB Created: 2020-10-10 07:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e6b8dcc73a3c2e6c0c4387ed1691541c SHA-1: a4063a61838a8a10c05c50fa7d5c10f71eadbe42 SHA-256: e5aaabe0615851e4ef3357dc96047456278fa99f73997cfc831d3dc25689b745
124 Risk Score

Malware Insights

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

This PDF document contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure related to a 'nyc tour guide license practice test'. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to a malicious site via a deceptive document.

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=nyc+tour+guide+license+practice+test In PDF document text
    • https://site-1038901.mozfiles.com/files/1038901/48880505014.pdfIn PDF document text
    • https://site-1038497.mozfiles.com/files/1038497/26099220281.pdfIn PDF document text
    • https://site-1036737.mozfiles.com/files/1036737/dutikaxekiku.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/xerotawebazirowe.pdfIn PDF document text
    • http://raleruno.elliesparkcity.com/uploads/1/3/2/8/132815004/10a8fc3166920.pdfIn PDF document text
    • http://files.ejchscounseling.com/uploads/1/3/1/8/131856594/fesevamurolus_zewetajaza.pdfIn PDF document text
    • http://besik.realearthnutrition.com/uploads/1/3/1/8/131871921/xamobinuwa.pdfIn PDF document text
    • http://jobuso.twinjsgourmet.com/uploads/1/3/2/3/132303099/975009.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/e31602a3-c271-4d06-9a6c-70cc82449930/22916034329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b210c5f0-79e9-4b36-bcc9-5b9a29e7ed3c/35996938587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca34e77-b2f0-432a-b164-4915c161be55/rudaledobuvozuwawo.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_off00006b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B77 5312 bytes
SHA-256: 0356d2beb25ffdf27a925990840d09dd3d4546461486c5f9caf2718d138110c0
font_01_sfnt_off00007da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA7 10320 bytes
SHA-256: 71c3ede8d75c78ecce53f310cf8f354ef28bb86e671ebd1fd9bef2d15db28b4b

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