Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db880d1dc169ede…

MALICIOUS

PDF

34.4 KB Created: 2020-08-16 00:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9782e660b0154d44ffc258fb8b7a9c8d SHA-1: 20d32c37c1195c37fd3e07f41ccf2abac2f8071b SHA-256: 5db880d1dc169ede6120a7850075e24c5286ca2106eb899ebd24cac134e58f21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector URL, which is a strong indicator of malicious intent. The document body also contains numerous links to external PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF with high confidence. The primary IOC is the redirector URL, which likely leads to a malicious payload or phishing page.

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.com/wb?keyword=fundamentals%20of%20aircraft%20and%20airship%20design%20pdf%20download
    • http://files.rutilawashburnancestry.com/uploads/1/3/0/8/130813696/dakirukenaferotirux.pdf
    • http://files.amandadenison.com/uploads/1/3/2/6/132681295/74dc03496.pdf
    • http://files.white-birch-farm-llc.com/uploads/1/3/1/4/131407406/kuzetupalazapo_kubaxage_bisegu.pdf
    • http://fisuta.daphnelunge.com/uploads/1/3/0/8/130813528/701a7e814.pdf
    • http://files.wallaroocampinghire.com/uploads/1/3/2/8/132815882/wenopejoviduf_donigafubivem_vetedal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0437/1863/9765/files/computer_oriented_statistical_methods_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/lavigadidoxow.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/riguxuzofatuseriboxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/fikukuwigomun.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/advantages_of_dbms_over_traditional_file_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/6120/6422/files/99762237730.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/83560997404.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/exercicios_de_analise_combinatoria_para_concursos_com_gabarito.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/bimuzewovofezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/56019364630.pdf
    • https://cdn.shopify.com/s/files/1/0433/0323/9840/files/fmea_5th_edition_changes.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_off00004900.bin
808ec83c6cb3fd34fc9feee8e5765207e3276615f34ebf3f382710c17c6a061b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4900 5616 bytes
font_01_sfnt_off00005c01.bin
28f79043e7182f753c02e2eebd94ca7a26c474533a48ddc9a4e5ab16329b459e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C01 9412 bytes

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