Malicious PDF — malware analysis report

Static analysis result for SHA-256 721de4a9b9f1c8ce…

MALICIOUS

PDF

43.7 KB Created: 2020-09-01 22:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 141f1d45592b21ae8150737bf2bb55f5 SHA-1: bb29b4f0723f88eba66044ef867dab5d1286c995 SHA-256: 721de4a9b9f1c8ce31de63f022228a6a0bbad44022c8022ece2b80d2e65d8e6c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=latex+arial+font+pdflatex
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/cc14e4_910b4895db3640d49c711c8d3e5f5831.pdf
    • https://static.usrfiles.com/ugd/49be48_190158fff91047438812bd3d0a93fa23.pdf
    • https://static.usrfiles.com/ugd/b8c837_1199727eb6db4ef891fdadd5cfa11628.pdf
    • https://static.usrfiles.com/ugd/b8c837_16ebe99b704746ec9d98455de98a22e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2bf66bbaf7a4b95838343b21e832e35.pdf
    • https://cdn.shopify.com/s/files/1/0432/5897/0280/files/fadetipufadosaxoliku.pdf
    • https://cdn.shopify.com/s/files/1/0465/0313/3342/files/kelejotagonafixuxaferij.pdf
    • https://cdn.shopify.com/s/files/1/0451/5836/7386/files/cedula_de_identificacion_fiscal_persona_moral.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7173/files/blackbird_beatles_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/21674367500.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5034/files/vaxavoki.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_off00006f08.bin
8f902023e42ed15a706631f20cd4d99bcb6d515339f572fc324ec2beb117512a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F08 4864 bytes
font_01_sfnt_off00007fb0.bin
275eb69d3a82e2f9c2cedcf5bb10b78f8f9de9db1785df4b6a46e3c081e52c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB0 10192 bytes

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