Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4c55b1d0af940c…

MALICIOUS

PDF

46.5 KB Created: 2020-08-08 13:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe952f0188966b04254786a517bb6473 SHA-1: 01649f7ccf27d347431abbbb86761d215483fc6c SHA-256: 7e4c55b1d0af940cc727f2307da36833476b421cd5f4cde57718949f1af0216c
120 Risk Score

Malware Insights

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

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.cc/wb?keyword=critical%20thinking%20quiz%20pdf'. This suggests a phishing or scam attempt where the user is tricked into clicking a link under the guise of a quiz. The document body, though heavily obfuscated, contains the same URL, reinforcing this finding. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious content.

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/wb?keyword=critical%20thinking%20quiz%20pdf
    • http://files.orffteacher.com/uploads/1/3/1/4/131483098/8a6d23ef0d.pdf
    • http://files.pickertfamilyfarm.com/uploads/1/3/1/3/131398187/gipukidulevezet.pdf
    • http://files.ittakesavillageys.com/uploads/1/3/2/6/132695633/e1c60b076ab.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/wizawekalewepizakim.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/bebidas_espirituosas.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/kefiwomekalanadivorewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/46797390423.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/48549451688.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/dubiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/29705708494.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/lawonexav.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/37706353668.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/nilajotovuzikazopoxax.pdf
    • https://cdn.shopify.com/s/files/1/0440/0830/8886/files/2861756267.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/1/0432/3885/0728/files/48549451688

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007943.bin
41c4d473e2b82b240625793f67bd9be7baf3489cda3b264481afc459f37979f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7943 5384 bytes
font_01_sfnt_off00008b8a.bin
0d8d2943f4f2a4f6f1c89035955f12253ab525863d9a4c9b52312ad39ecb2cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8A 9708 bytes

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