Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fa6a9ac3f8622d…

MALICIOUS

PDF

57.2 KB Created: 2020-08-21 14:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a4b4f84b551594d719b1ac1b390e82f SHA-1: a393bf2447742fe8ded2ec2e60ff55db5103242b SHA-256: d3fa6a9ac3f8622d31bfe285d33351bb668f31efe9789d9e4f4daea6f5137604
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a link farm. The embedded URL points to a redirector service, which is a common technique for distributing malware or conducting phishing attacks. The document body, though heavily obfuscated, contains the malicious URL, reinforcing its purpose. The ML classifier also strongly indicated 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/pify?keyword=distributive+property+and+combining+like+terms+worksheet
    • http://fijegu.docgraf.com/uploads/1/3/1/6/131606227/f6250c8d5.pdf
    • https://cdn.shopify.com/s/files/1/0430/6108/4322/files/share_certificate_template_doc.pdf
    • https://cdn.shopify.com/s/files/1/0435/0243/6512/files/compound_complex_sentence_examples.pdf
    • https://cdn.shopify.com/s/files/1/0440/3331/0870/files/satijikatofubuguvakapa.pdf
    • https://cdn.shopify.com/s/files/1/0448/4435/1649/files/characterization_worksheet_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/59813688182.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5094/files/68750456392.pdf
    • https://cdn.shopify.com/s/files/1/0436/5726/5305/files/cinema_guide_alexandria.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3510/files/41232553900.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/fenunadunotoxepagowuwenij.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4658/files/30683241018.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/18615619603.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/52582749879.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7255/files/88266567806.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_off00009f0d.bin
02014687548e5ff1318c3e18b7d3515cadc45e4cb8be76dc3bc383cc6832ac24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0D 5944 bytes
font_01_sfnt_off0000b32c.bin
43ed67dd9adb94bef5a8f9295407d58458f47204c86355d81067eacad1e04fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32C 10536 bytes

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