The cross section for $\mathrm{t}\overline{{\mathrm{t}}}$ production in the all-jets final state is measured in pp collisions at a centre-of-mass energy of 8  $,\text {TeV}$ at the LHC with the CMS detector, in data corresponding to an integrated luminosity of 18.4  $,\text {fb}^{-1}$ . The inclusive cross section is found to be $275.6 \pm 6.1 ,\text {(stat)} \pm 37.8 ,\text {(syst)} \pm 7.2 ,\text {(lumi)} $   $\text {,pb}$ . The normalized differential cross sections are measured as a function of the top quark transverse momenta, $p_{\mathrm {T}}$ , and compared to predictions from quantum chromodynamics. The results are reported at detector, parton, and particle levels. In all cases, the measured top quark $p_{\mathrm {T}}$ spectra are significantly softer than theoretical predictions.