Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f22d44875e6ca7…

MALICIOUS

PDF

42.6 KB Created: 2020-07-29 07:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 077395d9881a1d1fa122b2456fbd7a02 SHA-1: efe5f15a3c2ce6c755a593bdabe816e50abac870 SHA-256: 26f22d44875e6ca725d80c730bec81f16dc867c488a7c98dd98d8aefd568aeed
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a large PDF link farm. While the document body is heavily obfuscated, the presence of these numerous links suggests an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=animals+photos++wallpaper+cave
    • http://files.alisonrothman.com/uploads/1/3/1/4/131482953/f8cff.pdf
    • http://files.weareslta.org/uploads/1/3/2/3/132303082/8199502.pdf
    • http://files.mx.thomasmadden.org/uploads/1/3/1/0/131070291/fda44f90941.pdf
    • https://cdn.shopify.com/s/files/1/0440/4841/6933/files/79654592959.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/feziveginon.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/noxegudotizixojuluwate.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/wefaxiwedoraxoxima.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/16148158141.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1802/files/32708646339.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/28898189519.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/79776883495.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_off00005459.bin
1941b6a16b7fe03e0308d80a1c27e73ea4afa73cbb52e769d270c59d742b3808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5459 5104 bytes
font_01_sfnt_off00006580.bin
81bbbe6801721903477efec6c9667cb143b5498c783c23c7e40e689df2db1002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6580 9532 bytes
font_02_sfnt_off00008652.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8652 16144 bytes

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