Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf4074297129959…

MALICIOUS

PDF

43.3 KB Created: 2020-10-10 15:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cef303e3d6a3ca402379145b2fa1c5a8 SHA-1: 85058f92cff339c662e5b36fc6517c6f14e52583 SHA-256: cbf4074297129959d37369767977731eaa92dfbd9781e1607489af388717a2a8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of a link farm hosted on disposable infrastructure, suggesting a phishing or redirection attempt.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=operations+with+scientific+notation In PDF document text
    • http://kabizon.rivercityfalconclub.org/uploads/1/3/0/9/130969744/fe7ebf7c3988.pdfIn PDF document text
    • http://files.asteme.com/uploads/1/3/2/6/132696018/sixuzixasudomixupi.pdfIn PDF document text
    • https://site-1036909.mozfiles.com/files/1036909/sanetav.pdfIn PDF document text
    • https://site-1039227.mozfiles.com/files/1039227/mapadita.pdfIn PDF document text
    • https://site-1039553.mozfiles.com/files/1039553/57035380115.pdfIn PDF document text
    • https://site-1040514.mozfiles.com/files/1040514/53871638713.pdfIn PDF document text
    • https://site-1038693.mozfiles.com/files/1038693/jasidepeta.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/a6f301fb-be8f-49df-bff6-587346d165d5/64965737278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7155eec-1c90-443e-a699-c095948f8e98/93322375260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c55ab9f-ec5b-43f9-807a-4499c84eb6cd/roniberawojovobanit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1b59ed-3753-4fae-a099-e9b621b6083f/matixawejijez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9492/8277/files/ee_nagaraniki_emaindi_movie_online_watch_movierulz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/supergnes_apk_download.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_off00006c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C59 5192 bytes
SHA-256: f197ec8e1f576f6e69a224beb061ee270e56278373c2551dc28babf5a1910dff
font_01_sfnt_off00007e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E06 10128 bytes
SHA-256: 1ccdf6f34736c2f989307d2aaee659a1c458b0799c8faff0911a69d4bc1d96c4

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