Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a2d5fdf0fb765…

MALICIOUS

PDF

38.8 KB Created: 2020-08-30 18:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e60e7f79df5729960602a6be8d77c5a SHA-1: 3c95479ca30f0ee751bacf989e0003f46a23fbb2 SHA-256: 3d5a2d5fdf0fb7654322846b03f1f955a97006b3c904528e57a2c9f17cfd5918
120 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, a technique often used in SEO poisoning or to distribute malicious content. One of the embedded URLs, 'https://ttraff.com/wix?keyword=fca+suayed+unam', is flagged as a known malicious redirector. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not a typical user-facing document but rather a container for links. The presence of a malicious redirector strongly suggests an intent to lead the user to a harmful destination.

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=fca+suayed+unam
    • https://cdn.shopify.com/s/files/1/0428/6464/0159/files/67582299027.pdf
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/ejercicios_de_arreglos_en_java.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/1335104726.pdf
    • https://static.usrfiles.com/ugd/b8c837_5df9caff6de54f7495ebebf00a58924b.pdf
    • https://cdn.shopify.com/s/files/1/0449/2853/2635/files/circle_theorems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/dieta_cetogenica_alimentos_permitidos_y_prohibidos.pdf
    • https://cdn.shopify.com/s/files/1/0433/4967/2091/files/matudabuvawikilal.pdf
    • https://static.usrfiles.com/ugd/b8c837_47b202d7a54d49bcb8fff20e4828ace3.pdf
    • https://static.usrfiles.com/ugd/f967ac_8cf0888a168247539a39332567e776d0.pdf
    • https://static.usrfiles.com/ugd/e4ff69_129f9c885e92459bbfd1a27f9b8b1909.pdf
    • https://static.usrfiles.com/ugd/cc03df_bfefad33a5ac4d8588fd6dc806e03f39.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_off00005a8a.bin
2a15a7f35bee930d2a59a66ab665d8a1eb375cc8ee472f7f444690bf02f7dc9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8A 5016 bytes
font_01_sfnt_off00006b8c.bin
459bbb4a3519982e34093af2ce356424d972c363f4eaa815c49b877846f922f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8C 10332 bytes

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