Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc31fea12e1e5941…

MALICIOUS

PDF

32.5 KB Created: 2020-08-22 18:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55b847fafb3b42dc06ac3cee130f0ffa SHA-1: 51d7cae483138a5d544a622e430279a34989a27f SHA-256: fc31fea12e1e59411e2d990b22f7f3d0ac13c6cd07d75d1068b6f6d28c276e85
120 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 a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at ttraff.cc, which is disguised as an educational worksheet. This suggests the document is designed to trick users into visiting malicious sites. No scripts were extracted from this sample.

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=concrete+and+abstract+nouns+worksheet+high+school
    • http://files.depressionwillfade.com/uploads/1/3/2/6/132683017/9c21188.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/puradibaloteletunazum.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/vetilaloviwekalibiriv.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2156/files/lus_vaz_de_cames_os_lusadas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/wutozepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/jupifakawedup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/setonadel.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/aabb_technical_manual.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_off00003f81.bin
4149686029b7a99926ebd24e812e7b48a01fd121772699e39e51367740cea440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F81 5404 bytes
font_01_sfnt_off000051e1.bin
99db3ee9b73d548c295dcb51c5bb3fad0c98c48d94b7b4d751b79570b31889d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E1 9844 bytes

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