Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42e8fb6835c2464…

MALICIOUS

PDF

34.7 KB Created: 2020-11-04 20:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f77b32acd03468eb4f319120b58f5b78 SHA-1: 7ece56282b762b217419a91677d716408143f7af SHA-256: b42e8fb6835c246450ea409ed7adc7efbbedc263f1b3606252bf06f8d5c9169f
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a "permission denied" error message to trick the user into clicking it. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of a malicious URL indicates an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.link/123?keyword=permission+denied+to+access+property+document In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5f8e55c5e4154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381997/normal_5f8b3f6dda0e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5f9b5049135f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5f96412b2b9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f99d03d917a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_5f9ffe842779b.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/f767159c-1609-429f-8646-db5b04031881/superlearning_2000_sheila_ostrander.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d05208-2fab-49ca-bad9-98fce4224561/cadencier_de_commande_exemple.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/29923208193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2964ab5-6833-4f9f-a308-2e2b5d53b2d5/the_cay_by_theodore_taylor.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/93098409799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2c9c45-5b62-42d5-acc0-e80300f5561d/xbox_prince_of_persia_warrior_within.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b364cf-0940-4a4c-a9f2-107e81f6acbc/uso_del_punto_y_coma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77289e1b-3260-4b38-94f6-6c078b6aa18e/wusugotezurigotepid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625fdd5d-9b36-4c39-8b21-40c093007903/gonagamilinaruvonipel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948584f2-acbd-479a-b38e-fd213b1de21a/pevomozivunatolusevedo.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_off00004781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4781 5292 bytes
SHA-256: a3e142d085b191c2f31f7e9e17b6d3b08989dcf0b4eb9e158de36d4cf45eaedd
font_01_sfnt_off0000596e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x596E 10620 bytes
SHA-256: 384634ac7965b5255cdf7f24c1a1b75ebadb451d05acf244605788a69c76e376

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