Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc3286b508887f2…

MALICIOUS

PDF

48.2 KB Created: 2020-08-21 04:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a144a3b62f14c31080560a6572957baa SHA-1: b96ec833074bcb3229dd8b9d167284ac6d75565e SHA-256: 1dc3286b508887f28ee58b1ae1800aa14e01306f7e6fb6eb7ec776398e346907
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=annotate+pdfs+in+evernote'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. 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.ru/pify?keyword=annotate+pdfs+in+evernote
    • http://desuwawu.xudedesigns.com/uploads/1/3/1/3/131381787/3a44b44180d21a6.pdf
    • http://muvow.galaxydawn.com/uploads/1/3/1/3/131383949/manijuxipujop.pdf
    • http://files.nancyribi.ch/uploads/1/3/1/3/131381003/580fa8255.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0293/files/analyzing_architecture_simon_unwin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5765/1613/files/anfitrion_plauto.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/20535995253.pdf
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/fuledemegerukun.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/bovad.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/30711242521.pdf
    • https://cdn.shopify.com/s/files/1/0432/1676/5087/files/android_listview_arrayadapter_viewholder.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/lexozevinubu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/guia_de_adestramento_de_ces_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/riper.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/lusitu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006865.bin
329e155e2f2e3a06fdc2882c46cf561d962fd3fc07c947c796f316dfc30a0f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6865 5052 bytes
font_01_sfnt_off000079a9.bin
a69fba57721df570196d586087d1a766387a37260e46ba3f53bce21fbc85fc66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 10620 bytes
font_02_sfnt_off00009de3.bin
2cadb2ae25cea88cb182acc54f62d1c218aef5f2772c4081b94d5d3cddde1204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE3 16388 bytes

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