Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c9f035c56dd3be…

MALICIOUS

PDF

14.5 KB Created: 2019-04-30 04:26:39 +01:00 Authoring application: mPDF 5.7
MD5: a5c231fe9f25627fda321640b4971fa0 SHA-1: cfc3ff38ad5980d90fe23bf8c85dc6230d7ac4e7 SHA-256: f8c9f035c56dd3befa27ce4b59fe318ce0a77a84f3e52d03dd7b55708a12764f
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified as a link farm. The ML classifier strongly suggests maliciousness. While no scripts were extracted, the PDF structure and the sheer volume of links indicate a deceptive pattern, likely intended to redirect users to malicious sites or for SEO poisoning. The URLs themselves appear to be benign, but their aggregation in this manner is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 2

  • 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 http://loaminoo.linkpc.net/1090095099092093099/Zarathustra-and-Zoroastrianism-A-Short-Introduction-by-Michael-Stausberg.pdf
    • http://loaminoo.linkpc.net/7099097096097090/Socialism-A-Very-Short-Introduction-by-Michael-Newman.pdf
    • http://loaminoo.linkpc.net/1090095099092095090/Zarathustra-Contra-Zarathustra-The-Tragic-Buffoon-by-Francesca-Cauchi.pdf
    • http://loaminoo.linkpc.net/3090093098090093/Place-A-Short-Introduction-by-Tim-Cresswell.pdf
    • http://loaminoo.linkpc.net/3099096097094092/Russell-A-Very-Short-Introduction-by-A-C-Grayling.pdf
    • http://loaminoo.linkpc.net/4093099090094098/Anarchism-A-Very-Short-Introduction-by-Colin-Ward.pdf
    • http://loaminoo.linkpc.net/7097095091091099/Cosmology-A-Very-Short-Introduction-by-Peter-Coles.pdf
    • http://loaminoo.linkpc.net/9091097093093098/Neoliberalism-A-Very-Short-Introduction-by-Manfred-B-Steger.pdf
    • http://loaminoo.linkpc.net/3093090095096096/Foucault-A-Very-Short-Introduction-by-Gary-Gutting.pdf
    • http://loaminoo.linkpc.net/2099090093099096/Statistics-A-Very-Short-Introduction-by-David-J-Hand.pdf
    • http://loaminoo.linkpc.net/7097094094092095/Hobbes-A-Very-Short-Introduction-by-Richard-Tuck.pdf
    • http://loaminoo.linkpc.net/9091092090090091/The-Elements-A-Very-Short-Introduction-by-Philip-Ball.pdf
    • http://loaminoo.linkpc.net/2096090094091096/Philosophy-A-Very-Short-Introduction-by-Edward-Craig.pdf
    • http://loaminoo.linkpc.net/4090099091094098/Schizophrenia-A-Very-Short-Introduction-by-Chris-Frith.pdf
    • http://loaminoo.linkpc.net/2099090095093094/Sociology-A-Very-Short-Introduction-by-Steve-Bruce.pdf
    • http://loaminoo.linkpc.net/5099090092094097/Kafka-A-Very-Short-Introduction-by-Ritchie-Robertson.pdf
    • http://loaminoo.linkpc.net/3099091094091090/Buddhism-A-Very-Short-Introduction-by-Damien-Keown.pdf
    • http://loaminoo.linkpc.net/7093096090096095/Conscience-A-Very-Short-Introduction-by-Paul-Strohm.pdf
    • http://loaminoo.linkpc.net/2099090093098094/Numbers-A-Very-Short-Introduction-by-Peter-M-Higgins.pdf
    • http://loaminoo.linkpc.net/4093099090094095/Atheism-A-Very-Short-Introduction-by-Julian-Baggini.pdf

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