Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b2de419cd12815…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 01:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5009e7263d22c07ec44324ffc61d7ed SHA-1: c5ae286c6a0c3f249ae1ff39e15e9342bd53fa69 SHA-256: b4b2de419cd1281546d921e45d2f170e0969beb1d30347a946d2da2d9779fff5
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files, characteristic of a link farm. One of these links redirects to a known malicious URL, indicating a potential phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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.cc/wix?keyword=cristalizador+evaporador+de+circulacion+forzada
    • https://static.usrfiles.com/ugd/20d83a_fa8404bbffed4d2598df93865c2290fe.pdf
    • https://static.usrfiles.com/ugd/83b1b3_88696c23f68e49959935028328c1451e.pdf
    • https://static.usrfiles.com/ugd/5b5da7_050a8093bd6a4083bb3406db4ad18a38.pdf
    • https://static.usrfiles.com/ugd/10b11f_1c40250952a54d358ea58254583c6330.pdf
    • https://static.usrfiles.com/ugd/18f527_9f290e69e6d84a7bba351b701e01390e.pdf
    • https://static.usrfiles.com/ugd/764aaa_87a0e60b760a4a1e9926aad4ff8d4855.pdf
    • https://static.usrfiles.com/ugd/b8c837_62554cc13aa845dcba8afb20289ed26a.pdf
    • https://static.usrfiles.com/ugd/516574_1125ae3da45742efb26a24fd018961ae.pdf
    • https://static.usrfiles.com/ugd/b444d4_aa3063f84cd14874a8f2a4ef88ffa2f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8720849d8cc43cc9628223bf32455db.pdf
    • https://static.usrfiles.com/ugd/b8c837_636df3f81567434b8f96819371890238.pdf
    • https://static.usrfiles.com/ugd/b8c837_799fc3ec7588419b9818c07b63ee78e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ef64ecb730745fa80d6796dcadb740c.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_off00005f07.bin
05997102da372b3a15784a5d0087d5e45acbd0f9118d90b795c9f7b1f5d8e52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F07 5164 bytes
font_01_sfnt_off000070b3.bin
41e4c44477240c93c9f9dca8092938d8c8b5c1c0db3a7e3b634f60874137fa9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B3 10716 bytes

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