Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cc99f8bf46ddd3…

MALICIOUS

PDF

39.8 KB Created: 2020-09-01 00:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd00c7eaaa8349563ff25f4c691dc3fd SHA-1: 7e8f41ff1c361aee57829bb7388d82d00e1ef859 SHA-256: 66cc99f8bf46ddd379ca9b10e480faa34acee65de44e2689618541cf981f3f02
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though obfuscated, contains a URL that is part of this redirection chain, suggesting a phishing or malware distribution attempt.

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=percy+shelley+ozymandias+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7739/2791/files/27746909278.pdf
    • https://cdn.shopify.com/s/files/1/0440/0037/9038/files/19063642996.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/14813742736.pdf
    • https://static.usrfiles.com/ugd/735189_f90de3099aa34848a94c2d12f9395f7d.pdf
    • https://static.usrfiles.com/ugd/724bd4_92ffb18c21be4b7aac78ab7a17df1d8a.pdf
    • https://static.usrfiles.com/ugd/857e61_e37091cd8dce4b55b04f07ed411c5505.pdf
    • https://static.usrfiles.com/ugd/36f25b_cb6f94f43db64f5fa0b6ea0caf67809d.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_7202fb43532b41f9ab7064d4aa4de1c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_849ea72b66b94d2296ea6375bc26e85b.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/88541185154.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/dorapumamirigefonegex.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_off00005e04.bin
3b3b2ddf7e1b96f0837a2e64c1aaa42fc621831aa753e1c7d8e635b7d2cbec18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E04 5548 bytes
font_01_sfnt_off000070c6.bin
87ce65e23e1fbfd64b20c35899fba6e02982605faedec249f416800acb406118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 10036 bytes

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