Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f263c7f0841dd9…

MALICIOUS

PDF

39.3 KB Created: 2020-08-11 20:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d546fe042925d7500bf775ab9a66740a SHA-1: 5fced1f7aa705478f9519b1399d7d8290dee0a38 SHA-256: e8f263c7f0841dd902eb34be3f66befe30786bbb7a6bc0a31fe6029dfd47a93e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Vocera badge manual' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous PDF links, many hosted on cdn.shopify.com, indicates a strategy to obscure the ultimate destination and potentially leverage benign-looking domains for hosting malicious content.

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 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.
  • 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.cc/wb?keyword=vocera%20badge%20manual
    • http://files.artbycynthiawebb.com/uploads/1/3/1/1/131164308/lowigezoredobegafe.pdf
    • http://files.ace-coop.org/uploads/1/3/0/9/130969681/4681785.pdf
    • http://files.urupongmedical.com/uploads/1/3/1/8/131856232/luxobojinuz.pdf
    • http://belive.annabelleterbetski.com/uploads/1/3/0/9/130969045/lideveja-bopujovagow-bubakisig.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3453/files/vaikom_muhammad_basheer_quiz_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/marshawn_lynch_hold_my_diiick.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/80795971412.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9610/files/d_d_unearthed_arcana_5e.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/agency_problem_in_corporate_governance.pdf
    • https://cdn.shopify.com/s/files/1/0429/2457/2835/files/6076155327.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/6185897966.pdf
    • https://cdn.shopify.com/s/files/1/0432/1856/7335/files/nubaxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5564/4823/files/advanced_accounting_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/67804481911.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/roman_aqueducts_and_water_supply.pdf
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/professional_handbook_of_architectural_working_drawings.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/janavuraxo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d0d.bin
5ba72b20742a9ff2e3e11cc04f1a62bed2816a8c21f65a2ff614361cbf0d36a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0D 5188 bytes
font_01_sfnt_off00006e8a.bin
0266d11faa8c7f2eba7004adf91efef2e068c4366d8f09072b3e028ef3f563f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8A 9996 bytes

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