According to the current official Terms and Conditions of the Samsung Apps Seller Office third party advertising is allowed under the following conditions:
16.4 You may include third party advertisement within Applications, which shall be subject to the then applicable Samsung advertising
guidelines. Samsung reserves the right to reject or remove advertising
that Samsung deems contrary to its advertising guidelines. These
guidelines are subject to change at any time and Samsung may waive any
of these guidelines at its discretion. Any revenues to be generated by
such third party advertisement within Applications shall not be
counted as the "Sales Proceeds" subject to revenue sharing between
Samsung and you under clause 6 and, therefore, you are entitled to
retain all revenues from such third party advertisement.
They are referring to the "Samsung advertising guidelines" which cannot be found anywhere (except for the TV part of Samsung Apps which is in contrast to the mobile part as it has its own Terms and Conditions). Thus no other restrictions than the ones mentioned earlier need to be applied in my opinion.