Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd337246c740986…

MALICIOUS

PDF

43.6 KB Created: 2020-07-31 07:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01d0a2718afa773aef1b88c9ad53c840 SHA-1: 06f7caaaf155f54c713bd8c54dc4a3cd4d2ee053 SHA-256: cfd337246c740986831c3783a7ee871c636003fa5259e6823aa59cc78ed0e154
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one link pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to an alphabet chart. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=a+to+z+alphabet+chart+with+pictures+pdf
    • http://files.bigsforkids.org/uploads/1/3/0/7/130775605/0d82a4e06193.pdf
    • http://files.mrsvoigtsclassroom.com/uploads/1/3/0/9/130969939/5003267.pdf
    • http://files.unboundtravelers.org/uploads/1/3/0/8/130873908/bb6f1a.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/8732643487.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/guxezakudefixir.pdf
    • https://cdn.shopify.com/s/files/1/0432/1676/5088/files/bolujuzew.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/xalujup.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/96581578189.pdf
    • https://cdn.shopify.com/s/files/1/0438/3929/1554/files/31519138416.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/51800879163.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/45017262550.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/56839429307.pdf
    • https://cdn.shopify.com/s/files/1/0428/7456/8860/files/31459443367.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/95366941100.pdf
    • https://cdn.shopify.com/s/files/1/0433/7824/5781/files/woxig.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/vesat.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/
    • https://cdn.shopify.com/s/files/1/0432/1676/5088/files/bolujuzew

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bc9.bin
77c2008f99f09c939da8413755a590964c68da2ce5ad066875c8614c178d9302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC9 5292 bytes
font_01_sfnt_off00007deb.bin
27bf2167288c9a27b30af9188a6df9b608a948d15d718532c13420c77b1dd034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEB 10376 bytes

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