Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66281018ec4cd3b…

MALICIOUS

PDF

35.0 KB Created: 2020-08-12 17:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8617b9bdb179e80f1dfbb0d4bdcfbe09 SHA-1: d0e7d8f24363ae1fab12f4fdbf8e6c00f9136460 SHA-256: f66281018ec4cd3b784772666cbf5c7c9ab619bd1cc868f6db7baa2573a1f1b1
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, characteristic of a link farm designed to improve search engine rankings or distribute malicious content. One of the primary links, 'https://ttraff.ru/wb?keyword=tropezar%20con%20la%20felicidad%20pdf%20descargar%20gratis', is flagged as a malicious redirector. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a container for malicious links.

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.ru/wb?keyword=tropezar%20con%20la%20felicidad%20pdf%20descargar%20gratis
    • http://files.wisconsinpurplemartins.org/uploads/1/3/2/6/132682970/7308128.pdf
    • http://rabopidiv.churchonthehillglenavon.com/uploads/1/3/1/1/131164250/vubebimusudif.pdf
    • http://lurolopi.uprighthealthandwellness.com/uploads/1/3/0/8/130874474/b57b907ec993.pdf
    • http://files.flight111.co/uploads/1/3/1/3/131398369/4079564.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/65578001922.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/mibewupuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7832/files/ascaris_lumbricoides_ciclo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6719/files/xegovo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4625/6295/files/39154143097.pdf
    • https://cdn.shopify.com/s/files/1/0433/1762/4990/files/pomekamokozopafemabelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5812/6245/files/8026346315.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3811/files/memutikiluledibubuteselib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1338/2044/files/maths_textbook_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0437/8158/7095/files/felarod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vewurobafug.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_off0000494f.bin
f0d6d75d230692413e4536452bd7862d49b20946499f9048ce0c50d55d85aa7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x494F 5324 bytes
font_01_sfnt_off00005b7a.bin
e1709367b50c6c8e8ff181853cdcc861b7b64a0fcab7ae6f293ca3d1e6a97bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7A 10776 bytes

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