Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f893c9132be05e…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 14:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a291d30237590b155c7fc1d0e87b7d1d SHA-1: 9452753588df6663b80511574258de01ce717f3d SHA-256: b8f893c9132be05e12e6a111e7b3e5846519e0305bb3b6eb93c45f4ac3eac6ce
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that is designed to appear as a book download but redirects to malicious infrastructure. The PDF also contains a large number of external links, many of which are to Shopify, suggesting a link farm for SEO poisoning or to host malicious content. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is the primary indicator of compromise.

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=introductory+mathematical+analysis+for+business+economics+14th+edition+pdf
    • http://files.raharmonyasianmedicine.com/uploads/1/3/2/6/132696112/ebf417.pdf
    • http://files.waitingonourmiracle.com/uploads/1/3/0/7/130775055/kodonajumewi_rukofoba_kujefelenig.pdf
    • http://files.elartedeamerica.com/uploads/1/3/1/4/131482988/gexomelonugog_zajibadesi_vuzisopetu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6273/8592/files/biodata_for_marriage_muslim_boy.pdf
    • https://cdn.shopify.com/s/files/1/0430/5482/5621/files/peperawukufuguviwiva.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9557/files/konukotusekoge.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/guia_cancer_de_tiroides.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/55420107516.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/40189479244.pdf
    • https://cdn.shopify.com/s/files/1/0434/9345/8070/files/totevi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/kajigemade.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/basapitevovuzuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/84737744378.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/zunaxilawamisalitazuxuga.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_off000068f1.bin
29bc3b0f94123ca3f68b0afee71c279afd303f95ca50016023a34329e53ef203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F1 5716 bytes
font_01_sfnt_off00007c42.bin
87a0f2b1134e2dbcc4937521fedf394c675e3e4d00d9b0c441ede5a917fe2bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C42 10788 bytes

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