Malicious PDF — malware analysis report

Static analysis result for SHA-256 f497c185c3d95fd3…

MALICIOUS

PDF

39.5 KB Created: 2020-08-11 23:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 795bf6052f244a3b8b1fe8107200af10 SHA-1: 59082a132b43aa6a8ce6e551dffbc5f6cc258819 SHA-256: f497c185c3d95fd316568052dd5ef921d0dc83b6c972b24d5ca82bbcb49313d8
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, https://ttraff.ru/pify?keyword=cambridge+a+level+economics+notes+pdf, is designed to appear as a search result for educational notes, likely to trick users into clicking it. The file itself is generated by wkhtmltopdf, suggesting it was programmatically created to host these links.

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=cambridge+a+level+economics+notes+pdf
    • http://files.misswaynecounty.org/uploads/1/3/2/6/132681851/1267092.pdf
    • http://files.abfabescapes.com/uploads/1/3/1/3/131397987/9eb18a6e.pdf
    • http://files.nlccpsw.org/uploads/1/3/1/4/131406841/fidijup.pdf
    • http://files.stratuscorpfinancial.ca/uploads/1/3/0/9/130969004/2899676.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/bulev.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/psychology_12th_edition_myers.pdf
    • https://cdn.shopify.com/s/files/1/0430/8412/0225/files/46220968200.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/7831401023.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/random_drawing_idea_generator_3._0.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/79842573802.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8424/files/dezuluf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/3499607870.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/budapest_metro_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/67048532468.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/kivufetudanos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/89213637822.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/zopoxulexozadufikeratajo.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_off0000583f.bin
913d0f477e92587d3d2f317947595d3bcaf2fdc451482327ec1026d95b96b6ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x583F 5580 bytes
font_01_sfnt_off00006b25.bin
a145d0cc72bcd48a12c34d9f129ae30e38707aef84b00802e2e44fd93dc2bc89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B25 11652 bytes

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