Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb003934244cf611…

MALICIOUS

PDF

36.2 KB Created: 2020-10-02 10:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f1f3def4e4f1567690a1473ba7d73621 SHA-1: 733f57bd5c7e88c6cdeace6618f0a1bdf3d46dd2 SHA-256: fb003934244cf61156391a8ab73cfa7120347ed92386995d06a1be2428fadf96
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure ('Dance your blox off') and references to the PDF creation tool, suggesting an attempt to trick users into clicking 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=dance+your+blox+off In PDF document text
    • https://site-1038312.mozfiles.com/files/1038312/pizate.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/57516670078.pdfIn PDF document text
    • https://site-1039731.mozfiles.com/files/1039731/17935242716.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/45243984844.pdfIn PDF document text
    • https://site-1039693.mozfiles.com/files/1039693/sodikexusorofobozibijezol.pdfIn PDF document text
    • https://site-1037192.mozfiles.com/files/1037192/vozelojila.pdfIn PDF document text
    • https://site-1038529.mozfiles.com/files/1038529/35708993026.pdfIn PDF document text
    • https://site-1037048.mozfiles.com/files/1037048/52731774375.pdfIn PDF document text
    • http://files.bluebonnetshophop.net/uploads/1/3/1/4/131452958/duxekari-vakilemixes-jigep.pdfIn PDF document text
    • http://basori.armadalecoc.com/uploads/1/3/0/9/130969027/8782751.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/73f6617c-cf08-426a-83b7-0336d0731928/22128891208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1496c0-dfe2-4db8-923a-7dc0e810683f/73074120887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1355ac2f-1580-4dd2-b8bc-f0e45852a468/waloriludadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0172a384-5239-4e4f-9e65-b1f3a46c95d0/65817648106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c0ac79-e2b4-4491-b02d-5f76d30cec32/sizizenomajoviw.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_off0000500b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x500B 5008 bytes
SHA-256: fac3186c00917c466bff2285d89a2f75311b9055afe0e5d04292cb4069618b0c
font_01_sfnt_off0000613b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613B 10380 bytes
SHA-256: 894387b078923ba340d916486478c250a282592ed1326b85351596544fcebecd

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