Identical APA-style In-text citations I am working on a paper in which I cite two resources from an online reference work with no author:

Ransomware. (2016). Malware Protection Center. Retrieved from http://www.microsoft.com/security/portal/mmpc/shared/ransomware.aspx
Ransomware. (2016). TrendMicro. Retrieved from http://www.trendmicro.com/vinfo/us/security/definition/ransomware/#logo

Unfortunately, these two works have identical in-text citations: &quot;('Ransomware,' 2016).&quot;  The only material I can find on situations like this is when the authors are the same, and the remedy is to append the letters &quot;a&quot; and &quot;b&quot; to the date, like (2016a).  These works, however, do not have the same author, so I do not think this fix can be used.  How should I differentiate between these two citations?
APA style attempts to resolve ambiguity related to the names of authors in both in text citations and the reference list. As far as I am aware, and this APA Style Blog comment confirms my belief, APA style does not attempt to resolve ambiguity about authors. In other words, as far as APA style is concerned in text citations do not need to differentiate between two different people with identical names.

As your example has no listed author, I would argue (although it does not appear to be addressed in the APA Style Guide) that as far as the citation is concerned the authors have the same name. In the case of multiple works with authors with the same name and year the in text citation just appends a, b, c, ... to the year.