Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31abb38d7838450…

MALICIOUS

PDF

57.3 KB Created: 2020-08-26 04:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f98efde6cd6240c2ec0aa62465cd577 SHA-1: 335ac124d6a5b373a80bbc5bff7a7f9e91500bc6 SHA-256: c31abb38d7838450637d96609f6881d9045140051f39597d42316f1a8a280c41
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, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and references to classification of tools, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic. No scripts were extracted from this sample.

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/pify?keyword=clasificacion+de+herramientas+segun+su+uso
    • http://bikajofe.aquaticsis.com/uploads/1/3/1/4/131438216/9713564.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/11884794549.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/98400936112.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fokadexowigexavutezirero.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/gevarapexuzaroj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/mumbles_voice_chat.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/math_worksheets_on_slope_and_y_intercept.pdf
    • https://cdn.shopify.com/s/files/1/0436/3229/6089/files/87457532296.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/92373847005.pdf
    • https://cdn.shopify.com/s/files/1/0433/7287/1832/files/89094952705.pdf
    • https://cdn.shopify.com/s/files/1/0439/7511/4910/files/62534464914.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/rafajafemevem.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8382/files/22707494737.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a7a.bin
7987edefc9d3d9f36920e1a033be7a171460e4de66285396600318428f98c671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7A 5340 bytes
font_01_sfnt_off00009c6f.bin
5508f3a70feff2a5c38e5c30f32c6338804d6720f96e8a96ccbb0e1d39145471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6F 14136 bytes
font_02_sfnt_off0000c83f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 4324 bytes

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