Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ea5c5d43c69535…

MALICIOUS

PDF

33.8 KB Created: 2020-08-30 00:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b0b744548ad807e5a8c41c74beaba0c SHA-1: 95a32111c3fef3a9aef706eb502d46b495e4d3c5 SHA-256: 32ea5c5d43c695356aa3ac440bd66ac6be7b6283ce34ac03db06403492d96863
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=premam+bgm+download+mp3'. This URL is presented within the document body, disguised as a download link for 'Premam bgm download mp3'. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains. The ML classifier strongly indicates maliciousness.

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.cc/wix?keyword=premam+bgm+download+mp3
    • https://static.usrfiles.com/ugd/b8c837_353b0119927641cb82803edbdeb8fc6f.pdf
    • https://static.usrfiles.com/ugd/0dd040_f617421a77fc480ba1bfea098c21b555.pdf
    • https://static.usrfiles.com/ugd/3f80ec_78504b22f46d4d3f86897483b64c907f.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_0158d9ebf8114d478c5ef367785fb31f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c080850913a1470aabe575ec17ed4d95.pdf
    • https://cdn.shopify.com/s/files/1/0433/3889/1419/files/jigig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/16483884794.pdf
    • https://cdn.shopify.com/s/files/1/0431/6751/4788/files/revuzav.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/regulation_of_cholesterol_synthesis.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5667/files/16885427694.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/46695421079.pdf
    • https://cdn.shopify.com/s/files/1/0432/1394/7041/files/sazutepikekofukovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8381/6359/files/9648215259.pdf
    • https://cdn.shopify.com/s/files/1/0436/0264/1059/files/28438671123.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/bullying_escolar.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_off00004538.bin
eaeb1b6d15c1f106d4e06f2ed6f5c6cc9f24ec38f07f5e367eea74edb92a6b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4538 5500 bytes
font_01_sfnt_off000057d8.bin
63b33cd8414474c53417db2a01b7760a4d588e176c7406e247b1bfb089b81c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57D8 9672 bytes

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