Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e5b40726fe19bb…

MALICIOUS

PDF

40.1 KB Created: 2020-08-14 19:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 074424a078ec958086b95d0370a9c732 SHA-1: 2912a4ba0536a69eb67fb7ec5f2e2421ca8c5ff2 SHA-256: b9e5b40726fe19bb944d46169c21d49738929014957dfead71ecf8ccbdf01d36
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as free coloring pages, but the primary link redirects to a known malicious infrastructure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this behavior. The document body text, though corrupted, contains keywords related to coloring pages, reinforcing the lure. The ML_NYX_PDF_MALICIOUS score indicates a high probability of malicious intent.

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/wb?keyword=spongebob%20coloring%20pages%20free%20pdf
    • http://files.whitneybush.com/uploads/1/3/2/6/132695391/giwunojiz.pdf
    • http://files.math-metropolis.com/uploads/1/3/1/3/131379732/mefoberaxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/dapukevujasuwegi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/mogafevoturexus.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/25105072641.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/58766438755.pdf
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/rgles_de_l_orthographe_franaise.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/zevide.pdf
    • https://cdn.shopify.com/s/files/1/0435/0358/3384/files/tutodadugidodedevigar.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/bumazubowen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojedeteremedadedarovir.pdf
    • https://cdn.shopify.com/s/files/1/0440/5365/9798/files/46648411457.pdf
    • https://cdn.shopify.com/s/files/1/0447/0718/4793/files/characteristics_of_information_technology.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/brahma_kumaris_murli_daily.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_off00005ddf.bin
4d7beabf267db1c070f76be8075371eb1c2e7d6f58bb1fb22f085f2d5506b8b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDF 5568 bytes
font_01_sfnt_off000070cd.bin
b21dd7b7baa4585e0e421aa64cd1ab2b7eaf53121a794064f583a4f806421e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CD 10356 bytes

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