Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a3763d6e3f8a01…

MALICIOUS

PDF

73.5 KB Created: 2020-10-31 21:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d092f08a8d9b5c062fdf5afdbadc4efc SHA-1: 9c84d0a3aa3a7f53fa7361eac59a966d32ca049b SHA-256: b1a3763d6e3f8a0150bc00ae7c3234e2875d9746986b21251d87b0d34f4bac68
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a book title, likely used as a lure. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL.

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=supervision+managing+for+results+9th+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5f91a495d5a29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0486/3649/3992/files/tukuwagumimeda.pdf
    • https://uploads.strikinglycdn.com/files/1cf6280a-c9e6-47d6-ac42-3be5416a4553/34392950497.pdf
    • https://uploads.strikinglycdn.com/files/bff4a0eb-6574-40f0-b5e8-713bec2a198c/24222748576.pdf
    • https://cdn.shopify.com/s/files/1/0482/0497/2186/files/lopovuxarenuwugikepajiv.pdf
    • https://uploads.strikinglycdn.com/files/d84e30a1-cf5b-4905-976a-ca22ec8cc2d0/mukunuxujavufawevaju.pdf
    • https://cdn.shopify.com/s/files/1/0496/4198/0067/files/lymphatic_system_structure_and_function.pdf
    • https://uploads.strikinglycdn.com/files/4bba98b6-90bc-4429-9c9e-5614ae3f8058/nibirenafokifeluwufi.pdf
    • https://cdn.shopify.com/s/files/1/0482/4095/1448/files/zipugafopajivore.pdf
    • https://uploads.strikinglycdn.com/files/d15e9d0c-1b31-4d38-809b-4df7b8077c71/lofulixasas.pdf
    • https://uploads.strikinglycdn.com/files/9ffab832-3e6c-4ee4-aa4a-7a98867d7189/el_desafio_del_amor.pdf
    • https://uploads.strikinglycdn.com/files/d81285d6-23c6-425d-b966-06a5eef9b3fe/tous_unis_dans_l_esprit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df85.bin
1fae51ac953e9e1306fffd4c4fa4e3fdbf40c00530292d5938f175dac27ca83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 5776 bytes
font_01_sfnt_off0000f305.bin
cc8475d0bbcc550c4d31b49b0939ea9fd757c3a6612aaeeb6bc07a430ffa5de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 11656 bytes

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