Malicious PDF — malware analysis report

Static analysis result for SHA-256 721c8fd9a60468b0…

MALICIOUS

PDF

42.5 KB Created: 2020-10-03 17:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 151710d0ada356cd19ad0eab2ba4130d SHA-1: eaae3e8fb96927cb14fa791e43ad4afe80e48f7a SHA-256: 721c8fd9a60468b0b10c9dda599aa697306c25131bea015eaf91560012092da1
162 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The presence of a download button lure further supports a malicious workflow. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content, likely for malware distribution.

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/pify?keyword=madden+nfl+16+apk+download In PDF document text
    • http://taras.wctherapygroup.com/uploads/1/3/2/6/132696056/tijozotolamawot-raniveruv-rupefewi.pdfIn PDF document text
    • http://lizalox.angusskiclub.com/uploads/1/3/1/4/131406809/dusalujufe.pdfIn PDF document text
    • http://files.gummystudios.com/uploads/1/3/1/1/131164552/deguvufiwijek-tozeverid-texuvazojogib.pdfIn PDF document text
    • http://jemurel.rivertonholidayfestival.com/uploads/1/3/2/8/132814989/5080151.pdfIn PDF document text
    • http://files.christinawei.com/uploads/1/3/0/7/130739625/fepewikesasexuf_xanezesiropur.pdfIn PDF document text
    • http://kujilaxeb.wyndancegoldens.com/uploads/1/3/0/8/130873810/moxidini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a5ddac4b-987d-43da-be2b-9d0bdfed366f/74638314370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0ba21e-07b4-40e5-b864-9118edfb6fd6/5276549439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0d4220-63d7-4fa6-b5d3-79610ce75a59/woganawipamip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097c64c8-1e4d-4a38-9a88-0c4027eaec6d/47287087786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90dbd90e-a34a-4dbd-9be6-ad40d1d2d357/24163459930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc112f8-4a6e-4df2-8ac9-621a1404c427/2165540616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9535d92-9c37-4354-a50a-e8d6ec57d99c/sedoxonidogiguzedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559117a4-47f8-46ae-b8b3-4cf8c1102a11/sofoxanoma.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA4 4788 bytes
SHA-256: e1701a7170cdd136d3e6e80730600013dd319c54f233012ab172333a4e4bf911
font_01_sfnt_off00006d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D12 9896 bytes
SHA-256: 131206ae96f4cb1d9e17fd6029d8b05bab3f773ade9c3ad76e96b18e2b2a4d51
font_02_sfnt_off00008f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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