Malicious PDF — malware analysis report

Static analysis result for SHA-256 155b5b5086805012…

MALICIOUS

PDF

32.2 KB Created: 2020-10-04 15:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a33ca882baaf44973b1154a33b5ced0 SHA-1: ad41bf4fd0d358bdcf5300779746ffe7f78c8ae1 SHA-256: 155b5b50868050123ee24632045b0cd01091efa5c1d4edaca534dbdad8dc6927
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, a common technique for SEO spam and phishing campaigns. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=xenoverse+2+best+evasive+skill'. The document body, though heavily obfuscated, contains a similar URL, suggesting the primary purpose is to redirect users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=xenoverse+2+best+evasive+skill In PDF document text
    • http://pupoz.pfma.net/uploads/1/3/2/8/132815154/lotubigebugato_zawaxatot_tawarej_nisarifaw.pdfIn PDF document text
    • http://bojibu.southernconcretepros.com/uploads/1/3/2/7/132740470/mimuse.pdfIn PDF document text
    • http://sitigidi.southwatercommunitycentre.org/uploads/1/3/1/6/131637881/ferum.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/newekovezeliv.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/lonaxuwetelorudojigetop.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/e629e212-a0a2-45cc-9ff2-0d5d10142b8a/sagomusedifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5dcd6a4-9883-4c3a-9fb8-6fb8d4b97191/19293603930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a83445e-8723-441a-ad68-d98cc727a5fd/kolavokezobawonukefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5df670d-fb3e-43a2-b169-03a7c7eebb4a/fogeveginugutupiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5cc337-1118-44cc-b8b2-6915c9cf6867/madupufofukimaki.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_off000043d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43D8 5052 bytes
SHA-256: 4e2ec83393ad18d68e1dc6d47058246014f92861c1032734f8ed15263b122dd9
font_01_sfnt_off0000551a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x551A 9156 bytes
SHA-256: 997e41dfe2bb748e48ae5442dcddba8e5404bddc468bef91643089620b1e5101

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