Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a71bda53bed069a…

MALICIOUS

PDF

46.2 KB Created: 2020-07-30 03:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 001a4e0ff3dc12bd4072ea2a8a6cfc48 SHA-1: 81c866e1e9ee41db6967fe7ae214bd2f5139ebb7 SHA-256: 3a71bda53bed069a8414e609d32d3fdfd29b4ab57354bf27ab9763fde6ef4fa4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of outbound links, many hosted on Shopify, likely to obscure the malicious intent. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF. The document body text, though heavily obfuscated, contains "Cpa marketing pdf", aligning with the lure of a marketing-related document.

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=cpa+marketing+pdf
    • http://files.dancetoyourheartsdelight.org/uploads/1/3/1/3/131398560/9587754.pdf
    • http://files.naluscientific.com/uploads/1/3/0/7/130739072/nedamanojuposodig.pdf
    • http://files.greensbororoadchurchofchrist.com/uploads/1/3/1/0/131070678/muwadiko.pdf
    • http://files.dancetoyourheartsdelight.org/uploads/1/3/1/3/131398560/9587754.pd
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/bijaperofilejuzadofudo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/movobefaziri.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/deduxipozijepakirutupuga.pdf
    • https://cdn.shopify.com/s/files/1/0437/7024/9374/files/kesegutigupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8067/8553/files/66242025594.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/busanarobakifibutose.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6330/files/kolawuxusezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/44918734542.pdf
    • https://cdn.shopify.com/s/files/1/0429/4869/0076/files/89384503271.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/55846657725.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/90903894886.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/nuxaxolu.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_off000077c6.bin
94d65f91cf3681301871bc18b38db6853436c59a37e857caf29eb4f9c748f8e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C6 4916 bytes
font_01_sfnt_off0000886c.bin
f5ded4a579a6a645993489c3de0fcd8c5dee16f80665f551701eb20296efd4a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886C 10544 bytes

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