Malicious PDF — malware analysis report

Static analysis result for SHA-256 31128687841756a3…

MALICIOUS

PDF

40.9 KB Created: 2020-08-03 18:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b77dcd7406a0232e77e6711102a1246c SHA-1: 43bd5472f51793990936d6d1da88d94e4b317458 SHA-256: 31128687841756a320118d66b8e28d808d19d391af2479c51d3c7a8894c2a4f8
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an ACCA syllabus. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL leads to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic suggests the document is part of a link farm, likely to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file.

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.cc/pify?keyword=acca+f6+syllabus+2020+pdf
    • http://ranunir.swcfcu.org/uploads/1/3/0/7/130776088/lixilijibo.pdf
    • http://files.assembly2237.kofc.com/uploads/1/3/1/4/131437886/buremowaj-xojedef.pdf
    • http://files.thebescourthouse.com/uploads/1/3/0/7/130738531/17335a8f52593.pdf
    • http://files.rebalancesudbury.com/uploads/1/3/2/6/132681392/potokozobajinopabov.pdf
    • http://files.littlebittaluckfarms.com/uploads/1/3/1/4/131483002/2477570.pdf
    • https://cdn.shopify.com/s/files/1/0448/5015/1584/files/masterbuilt_smoked_turkey.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4081/files/mixufubux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/nodagesexadinojovizasapo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2334/2495/files/timokomexow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/54737578550.pdf
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/73908142810.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/67565542808.pdf
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/verizon_smart_rewards_auctions.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/85603843744.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/bebubefugudotuzufen.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/c_binary_search.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_off00005fef.bin
4d32d169bc4a94a028e7b5f52ec1f4d616398dd57f58d39d136ea28aa57a1b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 5712 bytes
font_01_sfnt_off00007382.bin
a78fcdf61cfadfbef394cdac825af85ca98f96cac138556f30e06edb48f0a01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 10432 bytes

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