Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4e42c94a846527…

MALICIOUS

PDF

45.3 KB Created: 2020-10-29 16:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cef3a799b3e44764fea9ed0431bd37eb SHA-1: 163d6ad6db8660b080946cf7735eecb713052564 SHA-256: 3f4e42c94a846527035bd61c411b4269125487105ebee091598595048f58ad38
162 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm designed for SEO manipulation. One prominent link, 'https://cctraff.ru/aws?keyword=avast+secureline+vpn+5.3.458+license+file+with+full+crack+2020', is identified as a malicious redirector. The document body also contains this URL and other links, attempting to lure users into downloading cracked software.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=avast+secureline+vpn+5.3.458+license+file+with+full+crack+2020 In PDF document text
    • https://nelovemisero.weebly.com/uploads/1/3/4/3/134347795/94b2609651830c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5f9452b416c5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401711/normal_5f987a660316b.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/a6ed7f4a-c70d-40da-b678-2d08a6f09dee/4841014410.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/kadazilijawajamonaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c523bd-c1c7-4767-91d7-1318f5629113/xaxibu.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/jejiwufeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c4e6cd-448b-48d7-a35f-5253b7f531ab/59545684953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f812dde-172a-4e34-aefc-322e0e259e63/bupinonid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65540c7d-56f3-41c1-8c27-bc5b39a4816f/kekenavadorugolutere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce2738c-57b8-4a19-9445-9169d1bd8261/sibegitozoxoximomuxug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973a2462-41a4-4418-8385-13c42ac09222/73569469368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2cfb83-a977-43da-8a0f-aaadc49c2223/ghetto_poems_for_her.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_off00006c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6D 6184 bytes
SHA-256: 4b8fe546ccaad69f22b74d80d646b195ebc17771ab9dc2e3d271d505938983ef
font_01_sfnt_off00008199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8199 11304 bytes
SHA-256: f4b29be3ed6a9e684b456a99803dc11c4e80629b4bb486a8509de082f42643f1

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