Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf4cb9c145d0435…

MALICIOUS

PDF

43.6 KB Created: 2020-08-05 04:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5dd4575678d4aa894bc1cba1113fe7a SHA-1: 1b5b1199547480edfb0d7739c0dabf5cd346c372 SHA-256: ddf4cb9c145d04350bd17a24ef3f48c120fdce8b77c465a2aa1033d83a7cc8e0
150 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 suspicious or unknown domains, and one specifically to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a link farm designed to redirect users to malicious infrastructure. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack vector is clearly the malicious link distribution.

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=hyperbole+and+personification+worksheet+pdf
    • http://puxufuxen.nadinebertalli.com.au/uploads/1/3/0/7/130775413/a42a6c.pdf
    • http://files.scotthanberry.com/uploads/1/3/0/7/130740521/likijin-bomotirut.pdf
    • http://kuxifaso.badmonkeylures.com/uploads/1/3/1/6/131636612/7018634.pdf
    • http://xetilidu.kristareimer.ca/uploads/1/3/2/6/132681504/018184c2ce41b7f.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/vehicle_routing_problems_methods_and_applications_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/notetutus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0437/8594/5246/files/14049965725.pdf
    • https://cdn.shopify.com/s/files/1/0435/4313/4362/files/mowagavamufuzefekebopixil.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/20160728956.pdf
    • https://cdn.shopify.com/s/files/1/0440/2325/1094/files/ecco_hot_tubs_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/pepovokizupiritixude.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/vurorokazofitesus.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/lung_cancer_ppt.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_off00006c3e.bin
348b9178d530cf22cb4cdf63fb502433a011217c83f8dd59c2f612980d9900cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3E 5600 bytes
font_01_sfnt_off00007f53.bin
21f79ea3d448b60a35ddf4cf55f87c62a1cf1acf805e75111f87766216e21245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F53 10040 bytes

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