Malicious PDF — malware analysis report

Static analysis result for SHA-256 feecfba308ddc671…

MALICIOUS

PDF

51.4 KB Created: 2020-08-08 10:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b77923a433a92f1daf471766d35fc2e2 SHA-1: f957d6213a6ecf1899b3cafa361ab314901629df SHA-256: feecfba308ddc67146965c7e8e4687521430dd5c49e3f09adebe7a395bc7c819
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=bremsstrahlung+and+characteristic+radiation+pdf'. The document body, though heavily obfuscated, contains this URL, suggesting it's the primary lure. The presence of many external links, including to Shopify domains, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the true destination. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=bremsstrahlung+and+characteristic+radiation+pdf
    • http://files.hycartstudio.com/uploads/1/3/2/6/132681482/f57fb0.pdf
    • http://rixuzab.mccalldoylephotography.com/uploads/1/3/0/8/130814769/xedenipifir.pdf
    • http://files.mx.thomasmadden.org/uploads/1/3/2/7/132740905/8fa6991ab94a7.pdf
    • http://files.lisagoethemcginn.com/uploads/1/3/0/7/130740017/timavotebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2632/5409/files/28318637112.pdf
    • https://cdn.shopify.com/s/files/1/0430/1268/5977/files/wagofirenepumazare.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/973572712.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/wadufemiwapapavani.pdf
    • https://cdn.shopify.com/s/files/1/0428/9101/8396/files/84977897308.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8627/files/jofidopu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/tosijedufewamafoxuga.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/bomufojadujuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/2538/2051/files/blkoviny_chemie.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/vejofobutopesa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/nakuvup.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_off00008aa3.bin
c59ecbfdb5c21c744cc6741b1086cee306cd3d5b5a68e728763f5ab0d280868c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA3 5616 bytes
font_01_sfnt_off00009d93.bin
63084d2205866ad012685aea41d1e187f040708e3b44120f4a36c1540816ad4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D93 10176 bytes

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