Malicious PDF — malware analysis report

Static analysis result for SHA-256 be36b6d164d9871b…

MALICIOUS

PDF

41.6 KB Created: 2020-11-04 09:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dc3cd540e037733cef36d40704a2beaa SHA-1: 5cbd0522f3a8da1d9b86b0d5e348cb92e4112da3 SHA-256: be36b6d164d9871ba110c625e6bc16b67ba9ad44e2db76b57eb2503042791540
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, creating a link farm. One of the primary links, 'https://cctraff.ru/aws?keyword=unblocked+flash+games+76+get+on+top', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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/aws?keyword=unblocked+flash+games+76+get+on+top In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f93282b1ad4f.pdfIn PDF document text
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/7ca96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_5f991384cbb63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tabagelufazafew/1662236802.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/greenville_county_inmates_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5e38ab-48f0-4796-9f98-bc052b5d361c/jononisukuzuzakagikifen.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/rinne_no_lagrange_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/tejutenivum.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/probability_questions_and_answers_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/7_seals_of_revelation_kjv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10392893-14ff-4ce1-92e5-5dba53f8199c/xonugakeragokuguzejego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2cbc3ea-179a-44f1-9d41-9edb656cfad2/dofexoned.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38591d12-0c65-47dc-947f-4050aea318e8/32300058194.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/72334096610.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/72873920585.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/nanefafegoxeguwisabulok.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_off00006317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6317 5904 bytes
SHA-256: d437d4fd77f6c7819530598bdcc780a3c64d73debbf8f2373617267615c671f2
font_01_sfnt_off00007717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7717 10048 bytes
SHA-256: 6399dcc26495538e0998047b99c036477994535310ebf88f0d5673ac2a919138

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