Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3b9990cf338f66…

MALICIOUS

PDF

38.4 KB Created: 2020-08-24 00:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06f290a7713a2d59c13afffa2a29094d SHA-1: 5060dd3bf7be7cf776b5fb7af85d829de34a3b64 SHA-256: ae3b9990cf338f66a3507ad55ee7e89c3e71967d6feb87fcae68b9bb738392f9
150 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'Daikin ceiling ac manual' and the malicious redirector URL. The PDF_SEO_LINK_FARM heuristic also indicates the presence of numerous external links, suggesting a link-farming or redirection tactic. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the file.

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/pify?keyword=daikin+ceiling+ac+manual
    • http://files.ethnoarts.com/uploads/1/3/2/7/132710627/8b0bedce5d96.pdf
    • https://cdn.shopify.com/s/files/1/0434/2064/7576/files/gudag.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/zogipug.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/87727021011.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/22079498042.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/vawex.pdf
    • https://cdn.shopify.com/s/files/1/0434/1114/4861/files/vocabulary_about_environment.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/37346971398.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/multiply_strings_java.pdf
    • https://cdn.shopify.com/s/files/1/0462/9194/3584/files/67064246646.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/wopilinoxaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/97672045921.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3605/files/85576397000.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_off000052d9.bin
d423319fc0732d5adfbddc044200b67977207e84842ed849c04cae8116116b3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D9 4908 bytes
font_01_sfnt_off00006381.bin
16363cb39a382934e9cc03b7efdf46a88cfcc4af0977a0ee5ba7a9f1aba6644f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6381 13300 bytes

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