Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48c83c2a68d9ff6…

MALICIOUS

PDF

37.0 KB Created: 2020-08-30 09:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba18cfcf454f60215c2fba450c8e4976 SHA-1: 8b952e8b40edf130f1a03c334c51f69850aee0b8 SHA-256: b48c83c2a68d9ff62afc990eb5957cbe5fb9abdad41999b0cd225e08aa7d9516
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to an essay and the malicious URL itself. The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a larger link farm designed for SEO manipulation, likely to distribute malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent.

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/wix?keyword=my+favorite+animal+essay
    • https://static.usrfiles.com/ugd/b8c837_83384829fd414361a6b8c7de3dc7fae0.pdf
    • https://static.usrfiles.com/ugd/e3c460_e33f7ac9351244768c5e2a20cc4e9e30.pdf
    • https://static.usrfiles.com/ugd/b0b521_22b4e54a7c204a3e82e67ea0ecdca142.pdf
    • https://static.usrfiles.com/ugd/ade4e6_9bcdcb90362a419198460325f729c0f8.pdf
    • https://cdn.shopify.com/s/files/1/0457/5929/9748/files/roxubumumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9082/0774/files/sakuvazavegugorijev.pdf
    • https://static.usrfiles.com/ugd/b8c837_8acb103638da477987d634ea67792e25.pdf
    • https://static.usrfiles.com/ugd/f1d680_e03b8a1c7def43cda13b9348b3df4511.pdf
    • https://static.usrfiles.com/ugd/3f4b99_c227a57e75534376b30cecbf0381ee40.pdf
    • https://static.usrfiles.com/ugd/289c5e_e88c81cd7e4d43e6b9d55d9b04fc85e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a5a35a7d03f40fbaf8fd4d6f5967a72.pdf
    • https://cdn.shopify.com/s/files/1/0433/0225/6795/files/752843987.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/83303797017.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/56016079871.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/9811049300.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/geris.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_off00005433.bin
3dcfe05c65bdb828682da053eb3374298fd6aa362e84c4320cc4f9852e90473b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5433 5080 bytes
font_01_sfnt_off00006574.bin
eec61f5999ad0e0c1450ca065ec5d9d9d2176cb780c952906478b9e4bdaaff48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6574 9924 bytes

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