Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9260b1f1d8b2e25…

MALICIOUS

PDF

43.4 KB Created: 2020-08-25 10:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af668765e990cf359a1eb077c3b03062 SHA-1: 4363987a9b05260434d119d1a8e2eb7a0e540ec8 SHA-256: d9260b1f1d8b2e25ae03980c622624ae30ef8030e45d3fb986d6d6f75ac1a1c6
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 external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=aqours+live+and+fan+meeting'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL and several other PDF links, suggesting a link farm designed to obscure malicious intent and potentially lead users to harmful content.

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/pify?keyword=aqours+live+and+fan+meeting
    • http://files.umvotibeans.com/uploads/1/3/0/8/130814515/9b6f0.pdf
    • http://files.helporginc.org/uploads/1/3/0/7/130740049/fosewiko.pdf
    • http://karedik.resilientpeople.ca/uploads/1/3/1/4/131454215/fafab.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/pmbok_guide_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/vawiwemeziwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/ximix.pdf
    • https://cdn.shopify.com/s/files/1/0433/6068/2139/files/distribuio_binomial.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/sufuguwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/wasovux.pdf
    • https://cdn.shopify.com/s/files/1/0435/9267/9582/files/19349836987.pdf
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/pubojexopigokud.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/83777740976.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/lepinewuvokeradipijep.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7381/files/xufosa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fa9.bin
2f32373152b86590eb5c993bf8dbb57d20fc33770b92bc1ec6b5fd985d660553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA9 2828 bytes
font_01_sfnt_off000069b2.bin
25bb93f6814465af75e680e08d0d083ee44d086c28f03f65c785f28b6a0dd450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B2 5404 bytes
font_02_sfnt_off00007c01.bin
865be19a234ffac774b1eaf8a26a488709b4c75737994900aed0671f8ee9f84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C01 11000 bytes

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