Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9e724fc600e49f…

MALICIOUS

PDF

43.6 KB Created: 2020-10-25 18:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 56ca6a241df8d67d953220b322f98e08 SHA-1: b38131dac48bf0259d81f5385098be48f0653085 SHA-256: 9c9e724fc600e49f714f613a8dbdd41c82ea4c0dbb0323f8e0e92c040bf4c2ba
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a fake CAPTCHA heuristic, indicating a social engineering attempt to deceive the user. It also contains a critical heuristic for a malicious redirector link pointing to 'https://cctraff.ru/123?keyword=mortal+kombat+11+android+download', which is likely used to deliver a second-stage payload. The presence of numerous embedded links suggests a link farm or SEO poisoning tactic to increase visibility.

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 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/123?keyword=mortal+kombat+11+android+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_5f8c45d7eb5ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f879c746aced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f8c15d441eb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f87325e581ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9464/2340/files/42717562011.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/kefepuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2135/1587/files/nurxiovo_cotton_candy_machine_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7882/1043/files/19914797425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8912f6f1-ad8a-4cdd-9881-c3b28258fab2/wokevuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e9ad05-0aac-4af9-83e0-d095cb8f29a0/suvatowanikewadowis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fc2439-e2aa-4145-bf51-d845c16c936b/91949369643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc5b84d-13cf-4497-98a3-57ac7328392a/tamufevekidubumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da71cf52-9bee-49f5-80ca-7a44c7e5d351/psychodynamic_psychiatry_in_clinical_practice_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5714107d-900a-4254-aa9f-315ad09572ad/96893127928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5bd927-954a-4783-948c-94cd9f0cf2b8/chris_brown_indigo_album_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761b2cff-b643-4666-bb01-0afcbdef4251/birrell_and_davies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49ee368-f1b6-4103-bc03-fd8d93a94da1/72899855276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bbfc28b-12bf-4409-a42e-cee476317a3c/12993375258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d799d466-41d3-43db-b12a-449bac41ae9a/81134721222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb29aa7-e9be-45dc-9aa7-138677591d0b/josewabuxesemuvis.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_off00006b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B74 5144 bytes
SHA-256: 5a682e88d35466f7e084b287e9eee17a546e78aee36f45525a84db10f3cb759e
font_01_sfnt_off00007cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFB 10492 bytes
SHA-256: 7f997198b47f385d2b6357b603068a5746f71192e8580c3293dd0cc8b778de1f

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