Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54957ed2058cb91…

MALICIOUS

PDF

41.5 KB Created: 2020-10-02 13:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 945ae8cd4a8ac8769bcb5e1f3b8165a2 SHA-1: 6200adfe39686be03ed5f7a078456d3249a3bc86 SHA-256: b54957ed2058cb91045d8cb8a24a418981386a755c8cccd39a71b52fd5afb173
124 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to costing and a URL that matches the malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to a malicious site via a link disguised within the 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://gettraff.ru/strik?keyword=advantages+and+disadvantages+of+using+marginal+costing+as+compared+to+absorption+costing In PDF document text
    • https://site-1038901.mozfiles.com/files/1038901/tonokuset.pdfIn PDF document text
    • https://site-1039324.mozfiles.com/files/1039324/mupeferofazo.pdfIn PDF document text
    • https://site-1039215.mozfiles.com/files/1039215/wijifomaw.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/bifadawolowopupatolabol.pdfIn PDF document text
    • http://files.sarahcamillewilson.com/uploads/1/3/1/3/131383456/titalafumuwiza.pdfIn PDF document text
    • http://fizumegub.blankpagesworkshops.com/uploads/1/3/1/0/131070722/9565590.pdfIn PDF document text
    • http://vepuvexut.roryward.com/uploads/1/3/0/7/130775540/gimitivi_werarej.pdfIn PDF document text
    • http://foxoxid.woman-empower-yourself.com/uploads/1/3/0/8/130874359/muvix-liveduwukuz-bibedutupakawe-gunov.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/e765dd51-8d1c-48dc-a81f-05d0cffac798/94059640324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c63c813-711b-4cc6-bb26-568e28484655/35319515335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cec0fd-0676-4796-8da0-3a02014ad0e1/totinonivovifunuzokowoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc94ae97-06ff-4f98-b2ed-63bb89c031e1/30476730519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5711/4009/files/xevozodotavaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2644/4199/files/tomtom_user_manual_english.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_off00006312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6312 5664 bytes
SHA-256: 6d3f9240c643464e7f669c5e59b488a2be606e1983e4b23e597cb4e6fd2ea52a
font_01_sfnt_off00007649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7649 9884 bytes
SHA-256: e99651ad8fd2033520b858771d8be793ad7c497c678bf9a594fa0bc899c6ab48

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