Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ff5cd2c29a79d…

MALICIOUS

PDF

48.0 KB Created: 2020-08-01 15:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e50090a2c46d04c029f94f147362ac SHA-1: e98113fc978559f21974ae908282926a9f3702bf SHA-256: b66ff5cd2c29a79d67af7ab2c838860ad0dadd144808ac3dbb4cc72a4b560772
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of this link farm, suggesting the primary purpose is to lure users to external sites. No scripts were extracted, but the sheer volume of links points to a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=midnight+commander+mac
    • http://files.zoehay.com/uploads/1/3/1/0/131069860/e5fd93d391613.pdf
    • http://files.scsound.org/uploads/1/3/1/4/131453111/sisetovarunokot_kofej.pdf
    • http://files.markalldridge.co.uk/uploads/1/3/1/1/131164032/5159293.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/viwoperana.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nidosavexurirevinuno.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/jemuwezumukunezelufuzepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/46520426181.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/68337480802.pdf
    • https://cdn.shopify.com/s/files/1/0445/7952/0676/files/statistics_mcclave.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/xefujuborajaxomodugejifa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0395/files/91393975035.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/xifosaniwabimoxabejol.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0115/files/6967008890.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/86289808729.pdf
    • https://cdn.shopify.com/s/files/1/0436/2511/9904/files/4277520083.pdf
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/jenafodazefepi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b7e.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7E 6744 bytes
font_01_sfnt_off00005c63.bin
4458638e5993e2f5623c717cc3a1d90b503247a37f97e4a03e17243349cf5ac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C63 5148 bytes
font_02_sfnt_off00006db5.bin
d1fa9328c8daf1f117a16637375cc8fcc948d30daee31c20fd95d012b65151d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB5 2072 bytes
font_03_sfnt_off0000775a.bin
7c996b15aacaf89cbcc73fdb255f247fc9f2890e766fed20e8733296e6e35839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775A 11164 bytes
font_04_sfnt_off00009cba.bin
653593fd1d80a85ed6f0165f1aba34eea3860f78c4af0c5284fe4824caf7b9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBA 16120 bytes

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