Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a34c192e98be93…

MALICIOUS

PDF

44.1 KB Created: 2020-08-31 06:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a923feb05a7233c7ee483d09a2472055 SHA-1: fe40e49e6745d6071e4e51c73ba4fcbf03e27664 SHA-256: 49a34c192e98be93f61a6c509eeab950f8ae34f938ff5102da3366735cc4bc5b
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM indicates a large number of embedded links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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.
  • 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.
  • 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/wix?keyword=comportamientos+esperados+e+inespera
    • https://static.usrfiles.com/ugd/5fd5c1_bf1e514e5aac4c2a9754950a5afa9abd.pdf
    • https://static.usrfiles.com/ugd/c8a981_f37a5ce4154d4dd58c72acf50a695392.pdf
    • https://static.usrfiles.com/ugd/df4650_d3a1e04649984c56b38914176dab6ccc.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdf838f6053b4991886d3a1a2d6d2eaf.pdf
    • https://static.usrfiles.com/ugd/63022f_ac31284406bb4213adf61b30d408c8ae.pdf
    • https://static.usrfiles.com/ugd/299074_7b7def9478674cbca6ed0a2dd5beb2a5.pdf
    • https://static.usrfiles.com/ugd/6290de_7ba40a13eaac421bb7d0402819c1f660.pdf
    • https://static.usrfiles.com/ugd/0d9a50_9a466718e29248d598ead7fc5d715132.pdf
    • https://static.usrfiles.com/ugd/575363_1c1863e6cfb940f583ff3ac9ac42909a.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_39bd8a58682542fe8ebd374f06b736b1.pdf
    • https://static.usrfiles.com/ugd/b9801a_98d03478d689481caa5a654276bf4436.pdf
    • https://static.usrfiles.com/ugd/d775a9_b37bf74718de4c8c83fb7b93badbd5f1.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_off00006bce.bin
46e024314f96c67c696df3ffba7a1f6f676c22459e0779eccc944ff406819d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCE 4976 bytes
font_01_sfnt_off00007c92.bin
39f7c49087487417f664c4a93471bcfc05ec97f41dd62319a19b782e5687f729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C92 11456 bytes

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