Malicious PDF — malware analysis report

Static analysis result for SHA-256 14efe65fd94d5d1a…

MALICIOUS

PDF

43.3 KB Created: 2020-11-08 10:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f7255cd19c3b8afab47394f2c5139ab1 SHA-1: 22ffcff863d8bbeba00ab9fe133a6f28ca7cc8e7 SHA-256: 14efe65fd94d5d1a35742f2b7c56b75267952fbc3ee19541bc01388a52bf1259
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which are invisible and repeated, designed to trick the user into downloading a secondary payload. The primary malicious URL identified is https://traffnew.ru/123?keyword=delphi+forums+plaay.com, which is likely part of a phishing or scam campaign. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffnew.ru/123?keyword=delphi+forums+plaay.com In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f90a9cf56b61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5fa01a373ca21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_5f8d92f35c60b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5f970462cb6e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f8d3d3b0d361.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/15eb6f6a-ac60-41c4-961d-65856081fddc/kisamaguwonu.pdfIn PDF document text
    • https://zugagasegoza.files.wordpress.com/2020/11/41491533380.pdfIn PDF document text
    • https://karepoxazul.files.wordpress.com/2020/11/spirited_away_theme_song_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e99602b-d9fa-4015-a41d-5c0cc4361df7/tawabux.pdfIn PDF document text
    • https://delogifelet.files.wordpress.com/2020/11/14918277459.pdfIn PDF document text
    • https://gavedejeriro.files.wordpress.com/2020/11/48111867661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea7f103-0605-4702-810d-832ad87f7dfc/vunalib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34c1d38-7820-4f69-ab1e-f345725e35ba/71691223878.pdfIn PDF document text
    • https://vifinupano.files.wordpress.com/2020/11/ejercicios_ley_de_senos_y_cosenos.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_off00006a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A05 5388 bytes
SHA-256: 06f944f6cba4e7e3f165a2f65835dd3e901966876b110e31f178a10a9ed97ee4
font_01_sfnt_off00007c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3F 10608 bytes
SHA-256: f7d24dce0bc8a282fb8501b168f97417c5386d873d3115c841a326af98705cec

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