Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee277187a1caa5ec…

MALICIOUS

PDF

44.9 KB Created: 2020-11-04 01:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cef337471abd469b833850430a8d85c7 SHA-1: 16f224dbd2bb302a9182cc7fe8aa54a386f663ea SHA-256: ee277187a1caa5ec8720732c8a8cba7f32decdef6f280c5b3bad764a84a510b6
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text related to apartments for rent, suggesting a lure to entice users to click the malicious link. 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=mechanicsburg+pa+apartments+for+rent In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_5f9a0d6b6fe35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5f907014c55a3.pdfIn PDF document text
    • https://dekekutema.weebly.com/uploads/1/3/4/4/134440935/8ffad3cebcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f940339f29c3.pdfIn PDF document text
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/3e8c8a4e.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/5f01512803a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f90b9037ef5c.pdfIn PDF document text
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/92034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5f95c66085109.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/8488884.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/8667/2534/files/88988447172.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/88390418712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6f838d-2f91-4c3f-8f93-0d37232c72f6/sea_cucumber_stardew_valley.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/castle_raid_2_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/caroline_de_maigret_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4adf8dda-2f0f-48fd-a84a-f50b979e9f44/41417815657.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_off00007019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7019 5544 bytes
SHA-256: f8d21e91e93729daf22b79fe35609b5c2e338e4705777c5a006b6969428c6c9c
font_01_sfnt_off000082d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D4 10784 bytes
SHA-256: 4a7181bd7efa487b9fd3f1da49842fa705c5986ee875ee19882b45d551c8ad21

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