Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8303622360248b4…

MALICIOUS

PDF

33.4 KB Created: 2020-04-13 10:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c38da8e86ca107e64186dc5be4f7cc7d SHA-1: 45799166135f5296ec566c5bd48c7ed5647c55bb SHA-256: e8303622360248b4e8bff9243dfa3c5109e1652317eca65b4979914887909d38
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of external links, many of which point to other PDFs hosted on various domains. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, reinforcing the link farm attack pattern.

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://nekimastrategies.net/uploads/1/3/0/7/130776370/130776370.html#graco+simple+sway+stratus+baby+swing
    • http://ifabroad.com/uploads/1/3/0/7/130738792/5413179.pdf
    • http://cakesdelarosa.com/uploads/1/3/0/2/130271219/durafo-murubuxepino.pdf
    • http://bacsbooster.com/uploads/1/3/1/3/131380265/takego-jofof-genegasu.pdf
    • http://mycityrebate.com/uploads/1/3/0/4/130476661/pudarewutive-wexeluwawix.pdf
    • http://sgfcon.com/uploads/1/3/1/4/131405962/buwefoj.pdf
    • http://dubruleclinic.com/uploads/1/3/0/9/130969976/poxisitajomebanug.pdf
    • http://bealegendvintageclothing.com/uploads/1/3/1/3/131398145/d1d77579c8a.pdf
    • http://camgardeners.com/uploads/1/3/0/4/130483384/7275759.pdf
    • http://ironbrosgymwear.com/uploads/1/3/0/3/130323522/rotelarutoru.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_off0000583b.bin
a0636260fc2af2ac31d0aea56ba4252c70b05f2f44c5c2568846491867411b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x583B 8784 bytes

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