Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c46bb33acc1f7f9…

MALICIOUS

PDF

47.0 KB Created: 2020-04-18 08:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b2a4c693567846f4dfba44930b6d49fe SHA-1: 587342d7c5ac5a8c70e98855f6dc7508106f204c SHA-256: 3c46bb33acc1f7f9162751e45dc1f9a43fb5e827d57e73c3faea11bc04fbb6f1
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or SEO manipulation tactic. The ML classifier strongly suggests malicious intent. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic firings, reinforcing the link farm attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://wildcrumbpickup.com/uploads/1/3/0/9/130970012/130970012.html#animal+con+caparazon+formado+por+placas
    • http://ojiseegun.com/uploads/1/3/0/8/130814338/76945685ef65e19.pdf
    • http://kendralittle.com/uploads/1/3/0/7/130739557/3786101.pdf
    • http://keiqa.xyz/uploads/1/3/1/3/131378936/9308942.pdf
    • http://mikeflasterstein.net/uploads/1/3/1/4/131437445/9683279.pdf
    • http://thefocalpoint-optom.com/uploads/1/3/0/3/130323571/93d71c83f27.pdf
    • http://bridgestonehomestudy.com/uploads/1/3/0/3/130323929/butaravejujalifuwex.pdf
    • http://mymomhive.com/uploads/1/3/0/7/130776321/kozuto.pdf
    • http://majameistrite.ee/uploads/1/3/0/7/130776072/02ea986d314fb.pdf
    • http://claytongatemassagetherapy.com/uploads/1/3/1/4/131407364/252754.pdf
    • http://opencloud.us/uploads/1/3/0/3/130323666/nexuwopifip-liruzonogimuwu-juwamonumoruka.pdf
    • http://mrs-bailey.com/uploads/1/3/0/5/130550956/9038124.pdf
    • http://claytongatemass
    • 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_off0000833b.bin
63852bf0bcd6c2b37783bee2cac4ad12e813a1a881362838e6a24690e217a4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x833B 9556 bytes
font_01_sfnt_off0000a52d.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA52D 1708 bytes

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