Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccc7be98386a307…

MALICIOUS

PDF

39.9 KB Created: 2020-04-17 14:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bb0cb04e5494d4f6fc1579be4f7e7107 SHA-1: 0786b5bbe67504c7a12ea536533d1a496737e33e SHA-256: 1ccc7be98386a307c16bb7cfaf2f090a3b63a8be15fbfbfa57b5b9803c3888b9
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on unrelated domains, characteristic of a link farm or SEO poisoning technique. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The primary intent appears to be directing users to malicious content hosted on the linked domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://ankezimmermann.ca/uploads/1/3/1/3/131384489/131384489.html#tokyo+vintage+shopping+guide
    • http://risetoeducation.com/uploads/1/3/0/6/130620813/najejizuxo.pdf
    • http://avidaustralianshepherds.com/uploads/1/3/0/5/130544091/1557218.pdf
    • http://sathyavimal.com/uploads/1/3/0/5/130545429/nozapapojo.pdf
    • http://hecoma.de/uploads/1/3/0/5/130543050/rizuzixupitabov_dejasupam_pojomagikafe.pdf
    • http://alteanunez.net/uploads/1/3/0/7/130776225/vebudez_sunedaxuwisewe_jelazi.pdf
    • http://rimimmua.com/uploads/1/3/0/5/130589317/juvuladezuzadaj.pdf
    • http://helmskelly.com/uploads/1/3/0/6/130604315/1790566.pdf
    • http://believeink.shop/uploads/1/3/0/4/130489649/8109248.pdf
    • http://beautifulneuralnetworks.com/uploads/1/3/1/4/131406438/diwugutodumivepi.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007467.bin
a668861c0cc9472e629808bc483781e3d2510adc62c3af01223b330ecc3f9f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7467 8064 bytes

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