Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d7abac8791374d…

MALICIOUS

PDF

35.6 KB Created: 2020-08-12 19:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c468ba4a4e2bab48bd7108f009573b3a SHA-1: e334f6ce596205327afd285ccb02b44692aac950 SHA-256: e4d7abac8791374de7f41dd2b531922b9d07933bcba6006a45a70332183fcadf
150 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to appear as a financial accounting solution manual, but the primary link redirects to a known malicious domain. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this redirection. The ML_NYX_PDF_MALICIOUS classifier also strongly indicates malicious intent. The document body is heavily obfuscated but contains the malicious URL.

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.ru/wb?keyword=financial%20accounting%20volume%203%20solution%20manual%20pdf
    • http://files.antigonekoutalieri.com/uploads/1/3/1/4/131408572/gonijugagoba.pdf
    • http://files.clayshootingdevon.co.uk/uploads/1/3/1/4/131452841/nawuzibusados-nimoru-feriwubebexej-teput.pdf
    • http://kupeki.kozal.net/uploads/1/3/0/9/130969060/ragupiralexikitaga.pdf
    • https://cdn.shopify.com/s/files/1/0429/6343/5679/files/sakekemisuvigorever.pdf
    • https://cdn.shopify.com/s/files/1/0439/1626/3592/files/48629419480.pdf
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/65938877647.pdf
    • https://cdn.shopify.com/s/files/1/0438/6743/9259/files/basic_electrical_and_electronics_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0972/files/examples_of_organic_and_inorganic_compounds.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/44111779487.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/zaloxobire.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/41038117614.pdf
    • https://cdn.shopify.com/s/files/1/0438/4774/5698/files/libapuzepurudavababanotu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6558/0437/files/general_mathematics_textbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4252/files/86241001513.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8448/files/effects_of_water_pollution_on_aquatic_life.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_off00004b22.bin
e6e33d01a1f8b306fe6984619c87b2c13bf4c221ce9520188e8e4900f9aca148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B22 5556 bytes
font_01_sfnt_off00005e04.bin
86a9078c037525ac392689aae6a35a2abc8d46493f74d3c9120a926b5fcbb84e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E04 10308 bytes

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