Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7f76ba588ea1f4…

MALICIOUS

PDF

39.4 KB Created: 2020-10-13 22:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5418d3e393baab38ad4c0a78f6410b76 SHA-1: f944c921cac8f696faa06a47911f5e56d0c11155 SHA-256: bb7f76ba588ea1f40cf6237c6216d02d9e26356a5c236e8c7fc02257ef24820c
144 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=pursonic+robot+vacuum+manual`. The document body, though heavily obfuscated, appears to contain references to a 'Pursonic robot vacuum manual', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics indicate it is part of a link farm on disposable hosting.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=pursonic+robot+vacuum+manual In PDF document text
    • https://site-1048568.mozfiles.com/files/1048568/rozidofebuzajovelijuva.pdfIn PDF document text
    • https://site-1039217.mozfiles.com/files/1039217/wegosipusapuf.pdfIn PDF document text
    • https://site-1039566.mozfiles.com/files/1039566/59776068130.pdfIn PDF document text
    • https://site-1038931.mozfiles.com/files/1038931/kawudimi.pdfIn PDF document text
    • https://site-1038453.mozfiles.com/files/1038453/96282001450.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/tidivobinimigip-banez-batipafon.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/bawap.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/bb6ced57-4568-445b-8909-94ae77c3a686/68769183883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f10b058-340f-4b1b-bb7a-353061eda3e4/sopadoroxuzivenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b00dd0-2798-4eb4-abeb-08354cf9bb8c/terumagiwuzede.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_off00005d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3E 5148 bytes
SHA-256: b32c5cdf1ef1eb29bb267d7e531a5f22012420f9a67b668e40603c43087beeae
font_01_sfnt_off00006ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA6 10148 bytes
SHA-256: 145b23559d3f55f15fc529549d99fa1867122edcbb0fa05f46640f09c60297e1

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